OFFSET
1,1
LINKS
Muniru A Asiru, Table of n, a(n) for n = 1..2000
FORMULA
MAPLE
with(numtheory): seq(sigma(8*n-1)/8, n=1..10^3); # Muniru A Asiru, Mar 04 2018
MATHEMATICA
a[n_] := 8 (DivisorSigma[1, n] - n) + 4; Array[a, 62] (* Robert G. Wilson v, Dec 12 2017 *)
PROG
(GAP) List([1..10^5], n->8*(Sigma(n)-n+(1/2))); # Muniru A Asiru, Mar 04 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Nov 05 2017
STATUS
approved