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A129494
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Composite numbers n such that 4^n (mod n) is a power of 4 greater than 1.
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5
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6, 12, 15, 20, 22, 24, 26, 28, 30, 34, 38, 40, 46, 48, 56, 58, 60, 62, 66, 69, 72, 74, 77, 80, 82, 84, 85, 86, 87, 88, 91, 93, 94, 96, 102, 104, 105, 106, 111, 117, 118, 120, 122, 123, 126, 129, 132, 134, 140, 141, 142, 144, 146, 158, 159, 166, 168, 170, 177, 178, 182
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Complement to composite numbers: 4, 8, 9, 10, 14, 16, 18, 21, 25, 27, 32, 33, 35, 36, 39, 42, 44, 45, 49, 50, 51, 52, 54, 55, 57, ... - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 16 2008
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EXAMPLE
| 22 is a member of the sequence since 4^22 (mod 22) == 16.
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MATHEMATICA
| Select[ Range@ 161, IntegerQ@ Log[4, PowerMod[4, #, # ]] &]
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CROSSREFS
| Cf. A036236, A129492, A129493, A129495, A129496, A129497.
Sequence in context: A104210 A066312 A089341 * A001284 A063931 A001283
Adjacent sequences: A129491 A129492 A129493 * A129495 A129496 A129497
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 17 2007
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EXTENSIONS
| Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 16 2008
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