Primes produced by a pyramidal ( three variable sequence) that is based on the Euler totient and multiperfect sigma functions.
A117843
Primes produced by a pyramidal ( three variable sequence) that is based on the Euler totient and multiperfect sigma functions.
Terms
- a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =29a(9) =43a(10) =173a(11) =179a(12) =193a(13) =683a(14) =1657a(15) =2731a(16) =3677a(17) =3733a(18) =4001a(19) =5743a(20) =7823a(21) =7841a(22) =7901a(23) =9421a(24) =63031a(25) =63773a(26) =93287a(27) =157229a(28) =213539a(29) =235447
External references
- oeis: A117843