Numbers k such that k | sigma(k-1) + sigma(k+1).
A186103
Numbers k such that k | sigma(k-1) + sigma(k+1).
Terms
- a(0) =13a(1) =77a(2) =489a(3) =557a(4) =1101a(5) =1431a(6) =2409a(7) =8897a(8) =538209a(9) =2263024a(10) =8910721a(11) =13685781a(12) =17428321a(13) =962402769a(14) =128508838576
External references
- oeis: A186103