A376304 Strong pseudoprimes to base 2 that are not squarefree.

1194649, 12327121, 3914864773, 5654273717, 26092328809, 58706246509, 74795779241, 237865367741, 467032496113, 601401837037, 1101047056201, 1629827375177, 2327330361721, 3427506518801, 3950198906473, 6151420925105, 7816904988985, 16034307692677

Offset: 1

Author

Shyam Sunder Gupta, Sep 20 2024

Keywords

• nonn

Comments

The intersection of A013929 and A001262.

All members of this sequence are divisible by a square of a Wieferich prime.

Examples

			a(5) = 26092328809 = 21841 * 1093^2 is a strong pseudoprime that is not squarefree.
		

Links

• Shyam Sunder Gupta, Table of n, a(n) for n = 1..626

Crossrefs

Cf. A001262, A013929, A158358, A001220.