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A128995 For a number n, let r=n+1, s = the least number greater than r and coprime to nr; n is here if nr-s, rs-n and sn-r are all prime. 0
3, 4, 5, 6, 9, 13, 14, 15, 19, 20, 26, 32, 35, 36, 42, 55, 68, 88, 89, 93, 118, 145, 155, 169, 172, 174, 186, 234, 259, 330, 356, 384, 405, 488, 494, 495, 530, 569, 594, 608, 660, 715, 726, 746, 763, 779, 825, 863, 1069, 1124, 1143, 1149, 1320, 1342, 1365 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

14 is here because 14x15-17, 15x17-14 and 17x14-15 are all prime.

CROSSREFS

Sequence in context: A022884 A105857 A103055 * A014101 A039035 A065798

Adjacent sequences:  A128992 A128993 A128994 * A128996 A128997 A128998

KEYWORD

nonn

AUTHOR

J. M. Bergot, Apr 30 2007

EXTENSIONS

Edited by Don Reble (djr(AT)nk.ca), Jan 20 2008

STATUS

approved

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Last modified September 17 19:32 EDT 2014. Contains 246868 sequences.