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URL: https://oeis.org/A032627

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A032627

Primes that are concatenations of k with k + 4.

1

37, 59, 1721, 2731, 3539, 3943, 4549, 4751, 6367, 6569, 8387, 9397, 99103, 113117, 123127, 147151, 149153, 173177, 185189, 203207, 209213, 213217, 219223, 227231, 239243, 249253, 255259, 263267, 267271, 285289, 287291, 303307, 309313, 317321, 327331, 329333

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OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

tcat:= proc(a, b) a*10^(1+ilog10(b))+b end proc:

select(isprime, [seq(tcat(i, i+4), i=1..1000, 2)]); # Robert Israel, Nov 24 2025

CROSSREFS

Cf. A032609, A032619.

Sequence in context: A141851 A105461 A288617 * A357955 A168006 A354156

Adjacent sequences: A032624 A032625 A032626 * A032628 A032629 A032630

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 28 2010

STATUS

approved