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A032626 Primes that are concatenations of n with n + 3. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A032608, A032618.

Sequence in context: A244880 A101793 A262120 * A009054 A012018 A010963

Adjacent sequences:  A032623 A032624 A032625 * A032627 A032628 A032629

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified June 19 04:44 EDT 2019. Contains 324217 sequences. (Running on oeis4.)