Numbers k for which A000265(1+A000265(sigma(k))) is equal to A000265(1+k).
A336701
Numbers k for which A000265(1+A000265(sigma(k))) is equal to A000265(1+k).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =15a(4) =31a(5) =127a(6) =1023a(7) =8191a(8) =34335a(9) =57855a(10) =131071a(11) =524287a(12) =2147483647
External references
- oeis: A336701