A230483 Strong pseudoprimes (base 2) that become prime when two is subtracted.

4681, 29341, 42799, 49141, 52633, 85489, 90751, 104653, 458989, 1004653, 1082401, 1251949, 1302451, 1907851, 2510569, 2811271, 3090091, 3539101, 5044033, 5049001, 5489641, 5590621, 7177105, 9069229, 9073513, 9567673, 9995671, 10323769, 11473885, 12263131

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..5001 from Shyam Sunder Gupta)

Example

4681 is a strong pseudoprime (base 2) and 4679 is prime.

Crossrefs

Cf. A001567, A001262, A230484, A230485, A230487.

Sequence in context: A202431 A066731 A230487 * A022244 A252382 A190131

Adjacent sequences: A230480 A230481 A230482 * A230484 A230485 A230486

Keyword

nonn

Author

Shyam Sunder Gupta, Oct 20 2013

Status

approved