Numbers k such that k!4 + 2^8 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
A291349
Numbers k such that k!4 + 2^8 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
Terms
- a(0) =1a(1) =7a(2) =11a(3) =31a(4) =57a(5) =73a(6) =97a(7) =105a(8) =209a(9) =245a(10) =403a(11) =545a(12) =917a(13) =953a(14) =1177a(15) =1239a(16) =1283a(17) =1627a(18) =2465a(19) =3701a(20) =4479a(21) =4637a(22) =6349a(23) =7983a(24) =11155a(25) =13595a(26) =15547a(27) =17031a(28) =17609a(29) =24087
External references
- oeis: A291349