OFFSET
1,17
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16396
Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537
MATHEMATICA
Array[GCD[(# + 1)/2, 1 + DivisorSigma[1, #]] &[(2 # - 1)^2] &, 120] (* Michael De Vlieger, Aug 24 2020 *)
PROG
(PARI) A336697(n) = { my(s=((n+n-1)^2)); gcd((s+1)/2, 1+sigma(s)); };
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 18 2020
STATUS
approved