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A032623 Numbers n such that n concatenated with n + 8 is a prime. 1
1, 3, 13, 15, 21, 39, 49, 55, 69, 75, 91, 111, 115, 159, 163, 165, 169, 171, 183, 193, 195, 199, 201, 205, 211, 229, 235, 241, 249, 265, 271, 273, 289, 291, 309, 313, 319, 321, 325, 331, 333, 349, 351, 355, 363, 379, 381, 385, 391, 393, 405, 423, 441, 445 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..54.

CROSSREFS

Cf. A032613.

Sequence in context: A230508 A045233 A113487 * A146512 A082704 A152270

Adjacent sequences:  A032620 A032621 A032622 * A032624 A032625 A032626

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified October 21 12:12 EDT 2019. Contains 328299 sequences. (Running on oeis4.)