OFFSET
1,3
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000
MATHEMATICA
GCD[Total[#], Times@@#]&/@Table[{DivisorSigma[0, n], DivisorSigma[1, n]}, {n, 100}] (* Harvey P. Dale, Jul 17 2018 *)
PROG
(PARI) A087801(n) = gcd(sigma(n)+numdiv(n), sigma(n)*numdiv(n)); \\ Antti Karttunen, May 22 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 11 2003
STATUS
approved