A230485 Strong pseudoprimes n to base 2 such that n-2 and n+2 are primes.

3465253618401, 44202753561285411, 1640293473202755801, 10623546148468360251

Offset

1,1

Comments

For all n, a(n)-2 is in A230810. - M. F. Hasler, Dec 08 2016

Links

Table of n, a(n) for n=1..4.

Example

3465253618401 is a strong pseudoprime (base 2) and 3465253618399 and 3465253618403 are primes.

Crossrefs

Cf. A001567, A057942, A001262, A230483, A230484.

Sequence in context: A179649 A080123 A209834 * A172646 A222558 A290504

Adjacent sequences: A230482 A230483 A230484 * A230486 A230487 A230488

Keyword

nonn,more,hard

Author

Shyam Sunder Gupta, Oct 20 2013

Status

approved