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URL: https://oeis.org/A262102

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A262102
Pseudoprimes to base 5, written in base 5.
7
4, 444, 1332, 4221, 11111, 22131, 23404, 30031, 42241, 112443, 133321, 134421, 140122, 140411, 202401, 214244, 222223, 224104, 241121, 304011, 323131, 331401, 402201, 404041, 411313, 421411, 434411, 1001001, 1001331, 1010142, 1032032, 1140421, 1212131, 1224103, 1233321, 1302302, 1302401, 1414331, 1421124, 1440143
OFFSET
1,1
LINKS
FORMULA
a(n) = A007091(A005936(n)).
MATHEMATICA
base = 5; t = {}; n = 1;
While[Length[t] < 40, n++;
If[! PrimeQ[n] && PowerMod[base, n - 1, n] == 1,
AppendTo[t, FromDigits@IntegerDigits[n, 5]]]]; t
PROG
(PARI) lista(nn, b=5) = {for (n=1, nn, if (Mod(b, n)^(n-1)==1 && !ispseudoprime(n) && n>1, print1(subst(Pol(digits(n, b), x), x, 10), ", "); ); ); } \\ Michel Marcus, Sep 30 2015
CROSSREFS
Cf. A007091 (numbers in base 5), A005936 (pseudoprimes to base 5).
Sequence in context: A159514 A217269 A034985 * A104690 A300507 A215220
KEYWORD
nonn,base
AUTHOR
Abdul Gaffar Khan, Sep 11 2015
STATUS
approved