Numbers k such that S(S(k))=k, with S(n)=sigma(n)/4: 1/4-sociable numbers of order 1 or 2.

A113286

Numbers k such that S(S(k))=k, with S(n)=sigma(n)/4: 1/4-sociable numbers of order 1 or 2.

Terms

    a(0) =30240a(1) =32760a(2) =859320a(3) =898560a(4) =2096640a(5) =2178540a(6) =2234232a(7) =23569920a(8) =45532800a(9) =54996480a(10) =61281792a(11) =142990848a(12) =422688000a(13) =436205952a(14) =1379454720

External references