A243010 Pseudoprimes to base 5 that are not squarefree.

4, 124, 11476, 59356, 80476, 91636, 250876, 261964, 482516, 1385836, 1926676, 2428084, 2589796, 3743476, 4101796, 6797764, 9155476, 10701076, 10743436, 11263396, 13799836, 13859956, 15570556, 20396476

Offset: 1

Author

Felix Fröhlich, Aug 18 2014

Keywords

• nonn

Comments

Any term is divisible by the square of a base 5 Wieferich prime (A123692).

Intersection of A005936 and A013929. - Michel Marcus, Aug 21 2014

Links

• Amiram Eldar, Table of n, a(n) for n = 1..879 (terms below 10^12)

Crossrefs

Cf. A005936, A123692, A158358, A243089, A243090, A244065.

Programs

PARI

forcomposite(n=1, 1e9, if(Mod(5, n)^(n-1)==1, if(!issquarefree(n), print1(n, ", "))))