Numbers k such that 2*k+1 is the next prime after sigma(k).
A067795
Numbers k such that 2*k+1 is the next prime after sigma(k).
Terms
- a(0) =2a(1) =6a(2) =8a(3) =14a(4) =44a(5) =128a(6) =315a(7) =2144a(8) =32768a(9) =55328384a(10) =815634435
External references
- oeis: A067795