There are two perfect numbers, 6 and 28, that are less than 100.
No, the only perfect numbers under 100 are 6 and 28.
19 numbers.
4 of them.
101
Yes. The next perfect numbers are 496 and 8128.
No, the only perfect numbers under 100 are 6 and 28.
101
19 numbers.
The perfect numbers less than 100 are 6 and 28.
25
4 of them.
Infinitely many. There are a 100 perfect squares.
25 now.
18
The 3 digit numbers under 500 are 100 through 499.
No. The only perfect numbers less than 100 are 6 and 28. All known perfect numbers are even - it is unknown whether there are odd perfect numbers.
101