| 19929 | A no | Medium | |
| 19985 | A positive integer is divisible by 3 if and only if the… | Medium | |
| 20015 | The product Z of two prime numbers is between 10 and 30… | Medium | |
| 20036 | What is the remainder when 43^87 is divided by 5 | Medium | |
| 20042 | If n is a prime number greater than 5, what is the… | Medium | |
| 20228 | What is the smallest number which, when increased by 7, is divisible… | Medium | |
| 20290 | How many numbers from 10 to 1000000 are exactly divisible by 9 | Medium | |
| 20359 | When positive integer N is divided by positive integer J, the remainder… | Medium | |
| 20392 | What is the smallest number which when diminished by 10, is divisible… | Medium | |
| 20395 | Find the largest 4 digit number which isexactly divisible by 88 | Medium | |
| 20420 | 597**6 is divisible by both 3 and 11 | Medium | |
| 20442 | If integers a and b are distinct factors of 30, which of… | Medium | |
| 20447 | Which of the following are divisible by both 2 and 3 | Medium | |
| 20466 | How many of the following numbers are divisible by 16 | Medium | |
| 20470 | Can you find the smallest non fractional number such that If the… | Medium | |
| 20502 | What is the remainder when 3^381 is divided by 5 | Medium | |
| 20525 | What least number should be added to 1052, so that the sum… | Medium | |
| 20538 | How many of the following numbers are divisible by 132 | Medium | |
| 20546 | What is the product of the greatest 2 digit multiple of 9… | Medium | |
| 20571 | If x and y are prime numbers such that x > y… | Medium | |
| 20610 | What is the remainder when 43717^(43628233) is divided by 5 | Medium | |
| 20615 | If n is a natural number, then (6n^2 + 6n) is always… | Medium | |
| 20722 | Find the number of different prime factors of 6440 | Medium | |
| 20947 | The least number which should be added to 2497, so that the… | Medium | |
| 21087 | Find the total number of prime factors in the expression (4)^11 x… | Medium | |
| 21127 | If 8^z is a factor of 256!, which of the following could… | Medium | |
| 21150 | Which of the following has 15^80 as a factor | Medium | |
| 21172 | What least number should be added to 1053, so that the sum… | Medium | |
| 21183 | D is the set of all the multiples of 3 between 30… | Medium | |
| 21190 | How many integers from 20 to 150, inclusive, are divisible by 3… | Medium | |
| 21191 | The product of all the prime numbers less than 12 is closest… | Medium | |
| 21238 | How many different positive integers are factors of 20 | Medium | |
| 21275 | What least number must be added to 9599, so that the sum… | Medium | |
| 21282 | What is the greatest power that 3 can be raised to so… | Medium | |
| 21294 | Find a sum for first 5 prime number'ss | Medium | |
| 21325 | what is the remainder when 9614241 is divided by 99 | Medium | |
| 21347 | What is the least number which when divided by 5, 6, 9… | Medium | |
| 21368 | If n=5p where p is a prime number greater than 1, how… | Medium | |
| 21374 | What is the dividend | Medium | |
| 21391 | What is the dividend | Medium | |
| 21430 | What is the dividend | Medium | |
| 21593 | Find the least number must be subtracted from 427398 so that remaining… | Medium | |
| 21594 | The least number which should be added to 4298 so that the… | Medium | |
| 21649 | What is the greatest positive integer x such that 6^x is a… | Medium | |
| 21668 | On dividing 136 by a number, the quotient is 9 and the… | Medium | |
| 21710 | A credit card number has 6 digits (between 1 to 9 inclusive) | Medium | |
| 21736 | In a division, divident is 686, divisior is 36 and quotient is… | Medium | |
| 21857 | The smallest prime number is | Medium | |
| 21881 | For every even positive integer m, f(m) represents the product of all… | Medium | |
| 21918 | If b = 4p, where p is a prime number greater than… | Medium | |