Numbers k such that the denominator of k!/!k (= A000142(k)/A000166(k)) is prime.

A123438

Numbers k such that the denominator of k!/!k (= A000142(k)/A000166(k)) is prime.

Terms

    a(0) =4a(1) =5a(2) =6a(3) =7a(4) =10a(5) =11a(6) =15a(7) =16a(8) =34a(9) =44a(10) =63a(11) =66a(12) =168a(13) =427a(14) =575a(15) =928a(16) =1094a(17) =1218a(18) =1363a(19) =1713a(20) =5278a(21) =10814

External references