|
%I #9 Dec 30 2021 17:32:05
%S 0,1,-1,5,-11,24,-36,41,-31,32,-78,164,-196,116,-24,81,-239,339,-381,
%T 398,-242,52,-300,804,-756,244,-94,392,-784,1188,-1272,929,-543,150,
%U -258,1457,-1999,776,-212,1270,-2010,2172,-2280,1676,-348,-348,-1176,3524,-3340,1707,-1143,1254,-2386,3444,-2712,2568,-2360,490
%N a(1)=0; thereafter a(n) = (n-1)*sigma(n)-n*sigma(n-1) where sigma is the sum-of-divisors function A000203.
%H N. J. A. Sloane, <a href="/A335153/b335153.txt">Table of n, a(n) for n = 1..10000</a>
%t Join[{0},Table[(n-1)DivisorSigma[1,n]-n DivisorSigma[1,n-1],{n,2,60}]] (* _Harvey P. Dale_, Dec 30 2021 *)
%K sign
%O 1,4
%A _N. J. A. Sloane_, May 30 2020
|
