Numbers k such that k!4 + 2^4 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
A291344
Numbers k such that k!4 + 2^4 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
Terms
- a(0) =0a(1) =1a(2) =3a(3) =7a(4) =9a(5) =13a(6) =19a(7) =27a(8) =35a(9) =37a(10) =65a(11) =67a(12) =75a(13) =83a(14) =89a(15) =101a(16) =111a(17) =229a(18) =363a(19) =633a(20) =1605a(21) =1663a(22) =1769a(23) =1863a(24) =1947a(25) =2695a(26) =3003a(27) =5309a(28) =7835a(29) =9495
External references
- oeis: A291344