Numbers k such that k!4 + 2^7 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
A291348
Numbers k such that k!4 + 2^7 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
Terms
- a(0) =3a(1) =7a(2) =9a(3) =11a(4) =15a(5) =19a(6) =29a(7) =37a(8) =91a(9) =123a(10) =151a(11) =197a(12) =415a(13) =763a(14) =1817a(15) =2981a(16) =3977a(17) =4199a(18) =11667a(19) =12865a(20) =16873a(21) =19449a(22) =27213a(23) =31581a(24) =64877a(25) =65401
External references
- oeis: A291348