OFFSET
1,1
LINKS
FORMULA
From Amiram Eldar, Jan 06 2023: (Start)
MAPLE
f:= proc(n) local m;
m:= padic:-ordp(n, 2);
if m::odd then (2^(m+3)-1)/3 else 2^(m+3)-1 fi
end proc:
map(f, [$1..200]); # Robert Israel, Nov 19 2017
MATHEMATICA
k=4; Table[Numerator[DivisorSigma[1, k*n]/DivisorSigma[1, n]], {n, 1, 128}]
PROG
(PARI) A088839(n) = numerator(sigma(4*n)/sigma(n)); \\ Antti Karttunen, Nov 18 2017
CROSSREFS
KEYWORD
easy,nonn,frac
AUTHOR
Labos Elemer, Nov 04 2003
EXTENSIONS
Typo in definition corrected by Antti Karttunen, Nov 18 2017
STATUS
approved