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Search: id:A129492
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| A129492 |
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Composite numbers n such that 2^n (mod n) is a power of 2. |
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+0
6
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| 6, 9, 10, 12, 14, 15, 20, 21, 22, 24, 26, 28, 30, 33, 34, 38, 39, 40, 44, 46, 48, 51, 52, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 72, 74, 76, 78, 80, 82, 84, 85, 86, 87, 90, 92, 93, 94, 96, 102, 106, 111, 112, 114, 116, 118, 120, 122, 123, 124, 126, 129, 132, 133, 134, 138
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Complement to composite numbers: 4, 8, 16, 18, 25, 27, 32, 35, 36, 42, 45, 49, 50, 54, 55, 64, 70, 75, 77, 81, 88, 91, 95, 98, 99, ....
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EXAMPLE
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15 is a member of the sequence since 2^15 (mod 15) == 8.
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MATHEMATICA
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Select[Range@ 141, IntegerQ@ Log[2, PowerMod[2, #, # ]] &]
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CROSSREFS
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Cf. A036236, A129493, A129494, A129495, A129496, A129497.
Sequence in context: A091886 A111774 A036347 this_sequence A053869 A085275 A090466
Adjacent sequences: A129489 A129490 A129491 this_sequence A129493 A129494 A129495
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 17 2007
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