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How many positive integers less than or equal to 100 have a prime factor that is greater than 4?
There are 80 such integers.
How many positive integers less than 100 have an odd number of positive divisors?
The squares -- nine of them.
How many positive integers less than 100 and divisible by 3 are also divisible by 4?
8 of them.
How many integers n greater than and less than 100 are there such that if the digits of n are reversed the resulting integer is n plus 9?
I'm assuming the question should read n greater than 10 and less than 100 and there are 8 numbers that satisfy this,1223344556677889So the answer is dhttp://www.webanswers.com/share-question.cfm?q=how-many-integers-n-greater-than-and-less-than-100-are-there-such-that-if-the-digits-of-n-are-the-is-1379ff| http://www.webanswers.com/answer/1566078/education/how-many-integers-n-greater-than-and-less-than-100-are-there-such-that-if-the-digits-of-n-are-the-is-1379ff| http://www.webanswers.com/report-abuse.cfm?q=how-many-integers-n-greater-than-and-less-than-100-are-there-such-that-if-the-digits-of-n-are-the-is-1379ff&p=1566078
What are all the integers less than 103 that have an odd number of positive divisors?
1, 4, 9, 16, 25, 36, 49, 64, 81, 100 -- the square numbers.
