Smallest prime factor of composite Mersenne numbers: lpf(2^p-1) where 2^p-1 is composite and p is prime.
A136030
Smallest prime factor of composite Mersenne numbers: lpf(2^p-1) where 2^p-1 is composite and p is prime.
Terms
- a(0) =23a(1) =47a(2) =233a(3) =223a(4) =13367a(5) =431a(6) =2351a(7) =6361a(8) =179951a(9) =193707721a(10) =228479a(11) =439a(12) =2687a(13) =167a(14) =11447a(16) =2550183799a(17) =745988807a(18) =3391a(19) =263a(23) =18121a(24) =852133201a(25) =150287a(26) =2349023a(27) =730753a(28) =359a(29) =43441a(30) =383
External references
- oeis: A136030