A230484 Strong pseudoprimes (base 2) that become prime when two is added.

253241, 280601, 580337, 1207361, 1678541, 1909001, 2419385, 5173601, 16324001, 18073817, 22849481, 25080101, 43363601, 60155201, 67194401, 82870517, 85519337, 97924217, 100943201, 102004421, 104857391, 116090081, 128987429, 134696801, 135969401, 145348529

Offset

1,1

Links

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

Example

253241 is a strong pseudoprime (base 2) and 253243 is prime.

Crossrefs

Cf. A001262, A230483, A230485, A230487.

Sequence in context: A270267 A255441 A210074 * A236874 A236163 A140967

Adjacent sequences: A230481 A230482 A230483 * A230485 A230486 A230487

Keyword

nonn

Author

Shyam Sunder Gupta, Oct 20 2013

Status

approved