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A230483 Strong pseudoprimes (base 2) that become prime when two is subtracted. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Shyam Sunder Gupta, Table of n, a(n) for n = 1..5001

EXAMPLE

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

CROSSREFS

Cf. A001567, A001262.

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

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Last modified April 24 22:26 EDT 2019. Contains 322446 sequences. (Running on oeis4.)