A337195 - OEIS

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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

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OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for sequences related to sigma(n)

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)));

CROSSREFS

Cf. A000203, A000265, A007814, A161942, A336698, A337194, A337196.

Sequence in context: A261337 A374998 A375000 * A368544 A260088 A364969

Adjacent sequences: A337192 A337193 A337194 * A337196 A337197 A337198

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 18 2020

STATUS

approved