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How many 2 digits numbers are such that the difference of the number and the number with the digits reversed is a perfect square?
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I am 13 My coach is 31 which is my age with the digits reversed What is the fewest number of years in which the digits of our ages will be reversed again?
after 11yrs.
How many two digit numbers have digits whose sum is a perfect square?
69
What numbers from 1 to 100 are prime when the digits are reversed?
imm they would b the same wouldn't they, except number 1 may repeat itself (number 1 and 100-001).
How many digits are there in the numbers 100-425?
525
How many 3 digit numbers are possible from the digits 012345?
Assuming that the first digit can't be zero: If repetition of digits is permitted: (5 x 6 x 6) = 180 numbers of 3 digits. If repetition of digits is not permitted: (5 x 5 x 4) = 100 numbers of 3 digits.
What number comes next in the sequence 61 691 163 487 4201?
9631. The sequence consists of the prime numbers which, when their digits are reversed, are perfect squares.
What are reversed prime numbers?
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
How many two digit whole numbers are increased by 18 when their digits are reversed?
7 two-digit numbers.
What prime numbers are still prime numbers when their digits are reversed?
Some of them are: 11 13 17 37 and 79
Which prime numbers less than 100 are also prime numbers when their digits are reversed?
13,31 17,71 37,73 79,97
What is the sum of all 4 digit numbers that are the same when their digits are reversed?
The sum of all palindromic numbers from 1001 to 9999 is 495000.
What prime numbers are still prime when their digits are reversed?
one is 17 and 71, another one is 11,
What are the first four numbers pi written backwards?
The first four digits, written backwards, will be 141.3. The reversed version of pi rounded to 4 digits will be 241.3
I am 13 My coach is 31 which is my age with the digits reversed What is the fewest number of years in which the digits of our ages will be reversed again?
after 11yrs.
You are 13My coach is 31 which is your age with the digits reversed What is the fewest number of years in which the digits of your ages will be reversed again?
11yrs.
How many of the numbers from 10 through 98 have the sum of their digits equal to a perfect and 8203 square?
There are 17 such numbers.
What are the prime numbers between 10 and 100 that are also pime when their digits are reversed?
(13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
