perplexus.info :: Numbers : Divisors' sum = square

Divisors' sum = square (Posted on 2019-05-27)

The number 22 divisors are 1, 2, 11, 22, which add up to 36, a square.
There are 4 more numbers like that below 100.

List them.

Submitted by Ady TZIDON

Rating: 3.0000 (2 votes)

Solution: (Hide)

OEIS A006532
Numbers n such that sum of divisors of n is a square.
1, 3, 22, 66, 70, 81, 94, 115, 119, 170, 210, 214,...
Trivial: 1
Prime: 3
Composite:
66 70 81 94 etc

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(2): Numbers	Brent Nagle	2023-03-09 01:53:26
Puzzle Thoughts	K Sengupta	2022-06-17 00:25:14
Amazing!	Daniel Perez	2019-07-08 06:49:50
Great!	Daniel Perez	2019-07-08 06:47:07
re(2): Numbers	tonny ken	2019-06-29 01:24:11
re: Numbers	Manuel Rigley	2019-06-06 13:56:53
re: Numbers	Manuel Rigley	2019-06-06 13:54:55
Sequence	Jer	2019-05-28 10:08:56
computer solution	Charlie	2019-05-27 15:54:32

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