%I #11 May 13 2023 18:32:18
%S 6,9,14,21,69,86,201,329,446,489,581,681,734,789,905,1094,1769,1941,
%T 2606,2921,3254,3369,3849,3974,4101,4629,4766,6729,7061,7401,8105,
%U 8654,9609,9806,10409,10821,11669,12326,13929,17429,17961,19049,20741,23109,23721,24341,27561,30281,31334,32405
%N Semiprimes of the form k^2 + 5.
%F a(n) = A242333(n)^2 + 5.
%e 69 is a term because 8^2 + 5 = 69 = 3*23.
%o (PARI) isok(k) = issquare(k-5) && (bigomega(k)==2); \\ _Michel Marcus_, Mar 27 2023
%Y Cf. A144255, A242333, A360739, A360740, A360741.
%Y Intersection of A117951 and A001358.
%K nonn,easy
%O 1,1
%A _Elmo R. Oliveira_, Mar 20 2023
|