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A336850
a(n) = gcd(A003961(n), sigma(A003961(n))), where A003961 is the prime shift towards larger primes.
11
1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 15, 1, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 1, 13, 1, 3, 1, 3, 1, 3, 5, 9, 1, 3, 7, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 5, 1, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 9, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 15, 1, 9, 1
OFFSET
1,6
FORMULA
a(n) = gcd(A003961(n), A003973(n)) = gcd(A003961(n), A336851(n)).
a(n) = A009194(A003961(n)).
a(n) = A003961(n) / A336849(n).
PROG
(PARI) A336850(n) = gcd(A003961(n), sigma(A003961(n)));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 05 2020
STATUS
approved