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A230484 Strong pseudoprimes (base 2) that become prime when two is added. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 19 13:16 EDT 2024. Contains 372694 sequences. (Running on oeis4.)