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A262105 Pseudoprimes to base 8, written in base 8. 7
11, 25, 55, 77, 101, 151, 165, 205, 231, 347, 421, 525, 741, 777, 1061, 1111, 1205, 1213, 1535, 1665, 1751, 2121, 2401, 2525, 2553, 2611, 3005, 3161, 3175, 3301, 3371, 3561, 3777, 4171, 4641, 4705, 5215, 5405, 6111, 6143 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A007094(A020137(n)).

MATHEMATICA

base = 8; t = {}; n = 1;

  While[Length[t] < 40, n++;

   If[! PrimeQ[n] && PowerMod[base, n - 1, n] == 1, AppendTo[t, FromDigits@ IntegerDigits[n, 8]]]];  t

CROSSREFS

Cf. A007094 (Numbers in base 8), A020137 (Pseudoprimes to base 8).

Cf. A258189, A262101, A262102, A262103, A262104, A262154.

Sequence in context: A161532 A328560 A118648 * A105270 A039337 A043160

Adjacent sequences:  A262102 A262103 A262104 * A262106 A262107 A262108

KEYWORD

nonn,base

AUTHOR

Abdul Gaffar Khan, Sep 11 2015

STATUS

approved

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Last modified August 18 08:46 EDT 2022. Contains 356204 sequences. (Running on oeis4.)