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Search: id:A056643
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| A056643 |
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Numbers n such that n | 4^n + 3^n + 2^n + 1^n. |
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+0
1
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| 1, 2, 5, 6, 10, 25, 30, 50, 65, 125, 150, 190, 250, 625, 750, 978, 1250, 1558, 1625, 2405, 2425, 2575, 3125, 3750, 3890, 5050, 6250, 13250, 15150, 15625, 18750, 25250, 31250, 40625, 71669, 72010, 75750, 78125, 93750, 95950, 96217, 99250, 115625
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OFFSET
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1,2
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FORMULA
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All numbers of the forms 5^k, 2*5^k & 6*5^k are in the sequence. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 21 2006
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MATHEMATICA
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Do[ If[ Mod[ PowerMod[ 4, n, n ] + PowerMod[ 3, n, n ] + PowerMod[ 2, n, n ] + 1, n ] == 0, Print[ n ] ], {n, 1, 10^6} ]
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CROSSREFS
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Cf. A001551.
Sequence in context: A123645 A057252 A057250 this_sequence A057256 A073825 A015891
Adjacent sequences: A056640 A056641 A056642 this_sequence A056644 A056645 A056646
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 25 2000
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