A032626 Primes that are concatenations of n with n + 3.

47, 811, 1013, 1619, 4447, 4649, 5659, 5861, 6871, 7477, 8689, 9497, 98101, 100103, 104107, 106109, 136139, 140143, 148151, 154157, 158161, 160163, 166169, 176179, 184187, 194197, 206209, 230233, 244247, 250253, 254257

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. A032608, A032618.

Programs

Mathematica

Select[Table[FromDigits[Join[IntegerDigits[n],IntegerDigits[n+3]]],{n,300}],PrimeQ] (* Harvey P. Dale, Mar 25 2015 *)