Numbers k such that Sum_{j=1..k} sigma(j) / sigma(k) is an integer.
A168127
Numbers k such that Sum_{j=1..k} sigma(j) / sigma(k) is an integer.
Terms
- a(0) =1a(1) =3a(2) =29a(3) =365a(4) =1225a(5) =81595a(6) =86249a(7) =185699a(8) =582917a(9) =11413204a(10) =16646745763a(11) =311408527843a(12) =709342670921a(13) =881267828693
External references
- oeis: A168127