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A339813
The exponent of the highest power of 2 dividing (A019565(n) - 1).
2
0, 1, 0, 2, 0, 1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 5, 0, 1, 0, 2, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 5, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 4, 0, 1, 0, 2, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 1, 0
OFFSET
1,4
COMMENTS
The 2-adic valuation of A339809(n).
LINKS
FORMULA
a(n) = A007814(A339809(n)).
PROG
(PARI)
A019565(n) = { my(m=1, p=1); while(n>0, p = nextprime(1+p); if(n%2, m *= p); n >>= 1); (m); };
A339813(n) = valuation((A019565(n)-1), 2);
CROSSREFS
Cf. A007814, A339809, A339814 (bisection).
Sequence in context: A355742 A267860 A325488 * A178111 A178112 A324852
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 18 2020
STATUS
approved