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A063938
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Numbers n such that n divides tau(n), where tau(n)=A000594(n) is Ramanujan's tau function.
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7
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, 28, 30, 32, 35, 36, 40, 42, 45, 48, 49, 50, 54, 56, 60, 63, 64, 70, 72, 75, 80, 81, 84, 88, 90, 91, 92, 96, 98, 100, 105, 108, 112, 115, 120, 125, 126, 128, 135, 140, 144, 147, 150, 160, 161, 162, 168
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Although most small numbers are in the sequence, it becomes sparser for larger values; e.g. only 504 numbers up to 10000 and only 184 numbers from 10001 to 20000 are in the sequence.
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LINKS
| Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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MATHEMATICA
| (* First do <<NumberTheory`Ramanujan` *) test[n_] := Mod[RamanujanTau[n], n]==0; Select[Range[200], test]
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CROSSREFS
| For the sequence when n is prime see A007659. Cf. A063940, A000594, A079334.
Sequence in context: A080672 A056757 A079333 * A002473 A174995 A161466
Adjacent sequences: A063935 A063936 A063937 * A063939 A063940 A063941
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KEYWORD
| nonn,easy
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 31 2001
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EXTENSIONS
| More terms from Dean Hickerson (dean.hickerson(AT)yahoo.com), Jan 03 2003
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