A032662 Smallest n concatenated with n + d (d = 0,1,2,3,...) is a prime.

1, 2, 1, 4, 3, 12, 1, 2, 1, 2, 3, 6, 1, 6, 3, 4, 5, 4, 5, 8, 7, 2, 21, 10, 17, 2, 1, 2, 3, 4, 1, 2, 7, 14, 3, 4, 1, 2, 1, 2, 11, 6, 5, 18, 3, 4, 3, 6, 1, 2, 1, 8, 5, 4, 7, 2, 1, 4, 5, 4, 11, 2, 1, 4, 3, 12, 1, 2, 9, 2, 3, 6, 1, 8, 9, 2, 3, 6, 1, 2, 1, 2, 5, 4, 929, 6, 3, 4, 5, 12, 1, 2, 1

Offset

0,2

Comments

First terms of sequences '1', A030457, A032617-A032624, continued with displacements d > 9.

Links

Table of n, a(n) for n=0..92.

Example

23rd term = 21: 21 + 22 (=23-1) = 43: '21' and '43' = 2143 and this is a prime.

Crossrefs

Cf. A032663.

Sequence in context: A217927 A284709 A307365 * A185413 A138509 A099331

Adjacent sequences: A032659 A032660 A032661 * A032663 A032664 A032665

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Status

approved