Numbers k such that k!4 + 2^3 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
A291343
Numbers k such that k!4 + 2^3 is prime, where k!4 = k!!!! is the quadruple factorial number (A007662).
Terms
- a(0) =3a(1) =5a(2) =7a(3) =9a(4) =11a(5) =13a(6) =19a(7) =23a(8) =25a(9) =33a(10) =39a(11) =41a(12) =63a(13) =67a(14) =71a(15) =85a(16) =87a(17) =91a(18) =133a(19) =171a(20) =243a(21) =291a(22) =1239a(23) =1543a(24) =1879a(25) =2169a(26) =2421a(27) =3149a(28) =3323a(29) =3377
External references
- oeis: A291343