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A328323
a(n) = gcd(A328316(n),A328316(1+n)).
5
1, 1, 1, 3, 1, 1, 1, 1, 2401, 861018571670257
OFFSET
0,4
COMMENTS
All terms are odd, because the parity of A328316 alternates.
a(10) is 208 decimal digits long, and can be found in the b-file.
LINKS
FORMULA
a(n) = A324198(A328316(n)) = gcd(A328316(n),A328316(1+n)).
PROG
(PARI)
A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
A328316(n) = if(!n, 0, A276086(A328316(n-1)));
A328323(n) = gcd(A328316(n), A328316(1+n));
\\ Or alternatively, as:
A324198(n) = gcd(n, A276086(n));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 14 2019
STATUS
approved