Numbers m that divide the alternating sum Sum_{k=1..m} (-1)^(k+1) * sigma_2(k).
A379922
Numbers m that divide the alternating sum Sum_{k=1..m} (-1)^(k+1) * sigma_2(k).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =42a(4) =329a(5) =633a(6) =1039a(7) =5689a(8) =26621a(9) =39245a(10) =1101875a(11) =1216075a(12) =40088584a(13) =67244920a(14) =104332211a(15) =549673265a(16) =777631064a(17) =19879301756
External references
- oeis: A379922