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A032662 Smallest n concatenated with n + d (d = 0,1,2,3,...) is a prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 28 10:51 EDT 2020. Contains 337393 sequences. (Running on oeis4.)