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

1,1

Comments

The intersection of A013929 and A001262.

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

Links

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

Example

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

Crossrefs

Cf. A001262, A013929, A158358, A001220.

Sequence in context: A345641 A346354 A158358 * A247830 A151560 A235247

Adjacent sequences: A376301 A376302 A376303 * A376305 A376306 A376307

Keyword

nonn

Author

Shyam Sunder Gupta, Sep 20 2024

Status

approved