A057942 Pseudoprimes k to base 2 such that k-2 and k+2 are primes.

645, 25761, 212421, 332949, 656601, 6212361, 63560685, 413435121, 1112691009, 1121315385, 1239702465, 2851612221, 5616154545, 6454103601, 6689540901, 9691152801, 9728582781, 11970358401, 12028438605, 15076352901, 17402551365

Offset

1,1

Comments

B-file extended using Feitsma's tables of pseudoprimes. - Giovanni Resta, Aug 20 2018

Links

Giovanni Resta, Table of n, a(n) for n = 1..7000 (first 73 terms from Amiram Eldar)

C. K. Caldwell, Pseudoprimes

Jan Feitsma and William Galway, Tables of pseudoprimes and related data

Andrzej Rotkiewicz,  On pseudoprimes having special forms and a solution of K. Szymiczek's problem, Acta Mathematica Universitatis Ostraviensis, Vol. 13, No. 1 (2005), pp. 57-71.

Index entries for sequences related to pseudoprimes

Crossrefs

Cf. A001567.

Sequence in context: A063844 A265684 A067845 * A230488 A228575 A250989

Adjacent sequences: A057939 A057940 A057941 * A057943 A057944 A057945

Keyword

nonn

Author

Patrick De Geest, Oct 15 2000

Extensions

More terms from Don Reble, Nov 03 2001

Status

approved