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A337195
The 2-adic valuation of 1+A000265(sigma(n)), where A000265 gives the odd part.
4
1, 2, 1, 3, 2, 2, 1, 4, 1, 1, 2, 3, 3, 2, 2, 5, 1, 3, 1, 1, 1, 1, 2, 4, 5, 1, 1, 3, 4, 1, 1, 6, 2, 2, 2, 2, 2, 4, 3, 1, 1, 2, 2, 1, 3, 1, 2, 5, 1, 1, 1, 1, 2, 4, 1, 4, 1, 1, 4, 1, 5, 2, 1, 7, 1, 1, 1, 6, 2, 1, 1, 2, 1, 1, 5, 2, 2, 1, 1, 1, 1, 6, 1, 3, 2, 1, 4, 1, 1, 1, 3, 1, 1, 1, 4, 6, 1, 2, 3, 1, 2, 2, 1, 1, 2
OFFSET
1,2
FORMULA
a(n) = A007814(A337194(n)) = A007814(1+A000265(A000203(n))).
PROG
(PARI)
A007814(n) = valuation(n, 2);
A000265(n) = (n>>A007814(n));
A337195(n) = A007814(1+A000265(sigma(n)));
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 18 2020
STATUS
approved