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A275248 Sequence of pairwise relatively prime numbers of class P_4 (see comment in A275246). 8

%I

%S 10,21,187,247,713,1073,1927,2279,3953,4331,6059,7031,9991,10807,

%T 13843,14803,20413,20989,26219,28199,34189,34933,41567,44377,52891,

%U 54731,61937,66013,74513,76151,86881,91123,103603,106829,122491,125291,139093,142859,155989

%N Sequence of pairwise relatively prime numbers of class P_4 (see comment in A275246).

%t k = 4; t = Union[{2 (k + 1)}, Select[# NextPrime[#, 2] &@ Prime@ Range@ 120, # > 2 (k + 1) &]]; Last@ Select[#, ListQ@ # &] &@ Table[If[Length@ t < n, 0, t = DeleteCases[t, k_ /; MemberQ[Select[Drop[t, n], ! CoprimeQ[#, t[[n]]] &], k]]], {n, Length@ t}] (* _Michael De Vlieger_, Jul 21 2016 *)

%Y Cf. A000040, A001248, A089581, A275246, A275249, A275251, A275252, A275253.

%K nonn

%O 1,1

%A _Vladimir Shevelev_ and _Peter J. C. Moses_, Jul 21 2016

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Last modified August 11 06:25 EDT 2020. Contains 336422 sequences. (Running on oeis4.)