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A129493 Composite numbers n such that 3^n (mod n) is a power of 3. 5
6, 10, 12, 14, 18, 22, 24, 26, 30, 33, 34, 36, 38, 39, 46, 51, 54, 56, 57, 58, 62, 63, 66, 69, 72, 74, 78, 82, 86, 87, 90, 91, 92, 93, 94, 99, 104, 106, 108, 111, 112, 116, 117, 118, 120, 121, 122, 123, 124, 129, 132, 134, 135, 141, 142, 144, 146, 148, 154, 158, 159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement to composite numbers: 9, 15, 21, 25, 27, 28, 35, 42, 44, 45, 48, 49, 50, 52, 55, 60, 65, 68, 70, 75, ....

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

14 is a member of the sequence since 3^14 (mod 14) == 9.

MATHEMATICA

Select[Range@ 161, IntegerQ@ Log[3, PowerMod[3, #, # ]] &]

CROSSREFS

Cf. A036236, A129492, A129494, A129495, A129496, A129497.

Sequence in context: A114989 A175352 A175397 * A036350 A295076 A088829

Adjacent sequences:  A129490 A129491 A129492 * A129494 A129495 A129496

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Apr 17 2007

STATUS

approved

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Last modified November 20 23:06 EST 2019. Contains 329348 sequences. (Running on oeis4.)