A032631 Primes that are concatenations of n with n + 8.

19, 311, 1321, 1523, 2129, 3947, 4957, 5563, 6977, 7583, 9199, 111119, 115123, 159167, 163171, 165173, 169177, 171179, 183191, 193201, 195203, 199207, 201209, 205213, 211219, 229237, 235243, 241249, 249257, 265273

Offset: 1

Author

Patrick De Geest, May 15 1998

Keywords

• nonn
• base

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A032613, A032623.

Programs

Mathematica

Select[Table[FromDigits[Flatten[IntegerDigits/@{n,n+8}]],{n,1,301,2}], PrimeQ](* Harvey P. Dale, Sep 07 2019 *)

Extensions

Edited by Charles R Greathouse IV, Apr 28 2010