Numbers k for which sigma(k)/k - 4/5 is an integer.

A218427

Numbers k for which sigma(k)/k - 4/5 is an integer.

Terms

    a(0) =10a(1) =60a(2) =1170a(3) =114660a(4) =72602880a(5) =668304000a(6) =714954240a(7) =1307124000a(8) =1381161600a(9) =2701389600a(10) =8052817920a(11) =10181689600a(12) =643773312000

External references