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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.
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%I #5 Oct 19 2017 03:15:06

%S 3,4,5,6,9,13,14,15,19,20,26,32,35,36,42,55,68,88,89,93,118,145,155,

%T 169,172,174,186,234,259,330,356,384,405,488,494,495,530,569,594,608,

%U 660,715,726,746,763,779,825,863,1069,1124,1143,1149,1320,1342,1365

%N 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.

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

%K nonn

%O 1,1

%A _J. M. Bergot_, Apr 30 2007

%E Edited by _Don Reble_, Jan 20 2008

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Last modified September 24 02:17 EDT 2024. Contains 376185 sequences. (Running on oeis4.)