Smallest composite x such that sigma(x) + 2n = sigma(x + 2n).
A054905
Smallest composite x such that sigma(x) + 2n = sigma(x + 2n).
Terms
- a(0) =434a(1) =305635357a(2) =104a(3) =27a(4) =195556a(5) =65a(6) =12a(7) =39a(8) =20a(9) =56a(10) =916a(11) =80a(12) =212282a(13) =57a(14) =44a(15) =106645a(16) =52a(17) =125
External references
- oeis: A054905