A032630 Primes that are concatenations of n with n + 7.

29, 613, 2027, 2633, 3037, 3643, 4451, 6067, 6269, 6673, 7481, 8087, 8693, 10041011, 10341041, 10461053, 10861093, 10941101, 11041111, 11361143, 11421149, 11941201, 12001207, 12061213, 12141221, 12241231, 12501257

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. A032612, A032622.

Programs

Mathematica

Select[Table[FromDigits[Join[IntegerDigits[n],IntegerDigits[n+7]]],{n,1500}],PrimeQ] (* Harvey P. Dale, Sep 20 2016 *)

Extensions

Edited by Charles R Greathouse IV, Apr 28 2010