Mathematical Algorithms | Number Digits

Recent Articles on Number Digits !

1. Automorphic Number
2. Self Descriptive Number
3. Motzkin number
4. Narcissistic number
5. Schröder–Hipparchus number
6. Number of n digit stepping numbers
7. Deserium Number
8. K’th Boom Number
9. Pandigital Product
10. Neon Number
11. Harshad (Or Niven) Number
12. Tidy Number (Digits in non-decreasing Order)
13. Seeds (Or Seed Roots) of a number
14. Numbers having Unique (or Distinct) digits
15. Build Lowest Number by Removing n digits from a given number
16. n-th number with digits in {0, 1, 2, 3, 4, 5}
17. Number of Digits in a^b
18. Brahmagupta Fibonacci Identity
19. First digit in factorial of a number
20. Number with even sum of digits
21. Largest even digit number not greater than N
22. Number of digits in 2 raised to power n
23. n-th number whose sum of digits is ten
24. Minimum digits to remove to make a number Perfect Square
25. Count digits in given number N which divide N
26. Count digit groupings of a number with given constraints
27. Print first k digits of 1/n where n is a positive integer
28. Program to check if a given number is Lucky
29. Check if a given number can be represented in given a no. of digits in any base
30. Find element using minimum segments in Seven Segment Display
31. Find nth term of the Dragon Curve Sequence
32. Find the Largest Cube formed by Deleting minimum Digits from a number
33. Find next greater number with same set of digits
34. Find the Number which contain the digit d
35. Find nth number that contains the digit k or divisible by k
36. Find N integers with given difference between product and sum
37. Find the number of consecutive zero at the end after multiplying n numbers
38. Find first and last digits of a number
39. Find a number x such that sum of x and its digits is equal to given n
40. Find smallest permutation of given number
41. Find maximum number that can be formed using digits of a given number
42. Find count of digits in a number that divide the number
43. Find the occurrences of digit d in the range [0..n]
44. Find sum of digits in factorial of a number
45. Find n-th element in a series with only 2 digits (4 and 7) allowed
46. First digit in product of an array of numbers
47. Find n’th number in a number system with only 3 and 4
48. Find the smallest number whose digits multiply to a given number n
49. Find the Largest number with given number of digits and sum of digits
50. Form the largest number using at most one swap operation
51. Form a number using corner digits of powers
52. Position of n among the numbers made of 2, 3, 5 & 7
53. Powers of 2 to required sum
54. Expressing a number as sum of consecutive | Set 2 (Using odd factors)
55. Sum of digits written in different bases from 2 to n-1
56. Given a number N in decimal base, find number of its digits in any base (base b)
57. Reverse a number using stack
58. Check if a number is jumbled or not
59. Number of digits in the product of two numbers
60. Form the smallest number using at most one swap operation
61. Difference between sums of odd and even digits
62. Numbers having difference with digit sum more than s
63. Count n digit numbers not having a particular digit
64. Program to check Plus Perfect Number
65. Total numbers with no repeated digits in a range
66. K-th digit in ‘a’ raised to power ‘b’
67. Possible to make a divisible by 3 number using all digits in an array
68. Recursive sum of digit in n^x, where n and x are very large
69. Check if all digits of a number divide it
70. Counting numbers whose difference from reverse is a product of k
71. Maximize a number considering permutations with values smaller than limit
72. Number of decimal numbers of length k, that are strict monotone
73. Count square and non-square numbers before n
74. Counting numbers of n digits that are montone
75. Count numbers in range L-R that are divisible by all of its non-zero digits
76. Round the given number to nearest multiple of 10
77. First occurrence of a digit in a given fraction
78. Check if a number can be written as sum of three consecutive integers
79. Count numbers with unit digit k in given range
80. Convert to number with digits as 3 and 8 only
81. Find a Number X whose sum with its digits is equal to N
82. Count different numbers that can be generated such that there digits sum is equal to ‘n’
83. Check whether a number can be represented by sum of two squares
84. Total no of 1’s in numbers
85. Largest number with prime digits
86. Largest smaller number possible using only one swap operation
87. Representation of a number in powers of other
88. Sum of digits of a given number to a given power
89. Number of n digit numbers that do not contain 9
90. Check if given number can be represented as sum of two great numbers
91. Biggest integer which has maximum digit sum in range from 1 to n
92. Largest number less than N whose each digit is prime number
93. Smallest x such that 1*n, 2*n, … x*n have all digits from 1 to 9
94. Count of numbers satisfying m + sum(m) + sum(sum(m)) = N
95. Next higher palindromic number using the same set of digits
96. Program to count digits in an integer (3 Different Methods)
97. Next higher number using atmost one swap operation
98. Smallest number k such that the product of digits of k is equal to n
99. Count number of digits after decimal on dividing a number
100. Find n-th element in a series with only 2 digits (4 and 7) allowed | Set 2 (log(n) method)
101. To check a number is palindrome or not without using any extra space
102. Minimum number with digits as 4 and 7 only and given sum
103. Number of times a number can be replaced by the sum of its digits until it only contains one digit
104. Print last k digits of a^b (a raised to power b)
105. Number of digits in the nth number made of given four digits
106. Count total number of digits from 1 to n
107. Count numbers with difference between number and its digit sum greater than specific value
108. Given a number n, find the first k digits of n^n
109. Generate k digit numbers with digits in strictly increasing order
110. Pandigital number in a given base
111. Reverse digits of an integer with overflow handled
112. Number of occurrences of 2 as a digit in numbers from 0 to n
113. Digital Root (repeated digital sum) of the given large integer
114. Largest number smaller than or equal to n and digits in non-decreasing order
115. Check if frequency of each digit is less than the digit
116. N’th palindrome of K digits
117. Maximum and minimum sums from two numbers with digit replacements
118. Last non-zero digit of a factorial
119. Count numbers with same first and last digits
120. Generate all palindromic numbers less than n
121. Minimum sum of two numbers formed from digits of an array
122. Smallest number by rearranging digits of a given number
123. Largest palindrome which is product of two n-digit numbers
124. Count ways to spell a number with repeated digits
125. Finding sum of digits of a number until sum becomes single digit
126. Finding number of digits in n’th Fibonacci number
127. Reverse and Add Function
128. Print all n-digit numbers whose sum of digits equals to given sum
129. Program to find last digit of n’th Fibonnaci Number
130. Count positive integers with 0 as a digit and maximum ‘d’ digits
131. Count ‘d’ digit positive integers with 0 as a digit
132. Count numbers having 0 as a digit
133. Check if a given number is Fancy
134. Find the most frequent digit without using array/string
135. Count total number of N digit numbers such that the difference between sum of even and odd digits is 1
136. Count of n digit numbers whose sum of digits equals to given sum
137. Total number of non-decreasing numbers with n digits
138. Count numbers from 1 to n that have 4 as a digit
139. Compute sum of digits in all numbers from 1 to n
140. Remove repeated digits in a given number
141. Replace all ‘0’ with ‘5’ in an input Integer
142. Count numbers that don’t contain 3
143. Write a C program to reverse digits of a number

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