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A020486 Average of squares of divisors is an integer: sigma_0(n) divides sigma_2(n). +0
6
1, 3, 4, 5, 7, 11, 12, 13, 15, 17, 19, 20, 21, 23, 25, 27, 28, 29, 31, 33, 35, 37, 39, 41, 43, 44, 47, 48, 49, 51, 52, 53, 55, 57, 59, 60, 61, 65, 67, 68, 69, 71, 73, 75, 76, 77, 79, 83, 84, 85, 87, 89, 91, 92, 93, 95, 97, 100, 101, 103, 105, 107, 108, 109, 111, 112, 113, 115, 116 (list; graph; listen)
OFFSET

1,2

CROSSREFS

Adjacent sequences: A020483 A020484 A020485 this_sequence A020487 A020488 A020489

Sequence in context: A088130 A046840 A057773 this_sequence A091428 A047499 A082378

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.


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