[seqfan] Empirical relation for A180169: Sigma(A180162(n)), where A180162(n) is the smallest N such that sigma(N) is an nth power, or 0 if no such N can be found
Georgi Guninski
guninski at guninski.com
Fri Feb 25 16:45:07 CET 2011
A180169: Sigma(A180162(n)), where A180162(n) is the smallest N such that sigma(N) is an nth power, or 0 if no such N can be found
appears to satisfy for the first 465 terms (the B-File):
a(n+2) = -(4*(n - 12)*a(n - 1) - 3*(n - 10)*a(n + 1))/(n - 9)
this is the only potential relation involving sigma that i found.
is there a fast ways to compute more terms to check?
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