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Search: id:A020487
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A020487 Numbers n such that sigma_1(n) divides sigma_2(n). +0
5
1, 4, 9, 16, 20, 25, 36, 49, 50, 64, 81, 100, 117, 121, 144, 169, 180, 196, 200, 225, 242, 256, 289, 324, 325, 361, 400, 441, 450, 468, 484, 500, 529, 576, 578, 605, 625, 650, 676, 729, 784, 800, 841, 900, 961, 968, 980, 1024, 1025, 1058, 1089, 1156, 1225, 1280, 1296 (list; graph; listen)
OFFSET

1,2

CROSSREFS

Adjacent sequences: A020484 A020485 A020486 this_sequence A020488 A020489 A020490

Sequence in context: A066213 A010441 A046871 this_sequence A046870 A010461 A010421

KEYWORD

nonn

AUTHOR

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

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.


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