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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

The 2-adic valuation of A339809(n).

LINKS

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

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: A340928 A267860 A325488 * A178111 A178112 A324852

Adjacent sequences:  A339810 A339811 A339812 * A339814 A339815 A339816

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 18 2020

STATUS

approved

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Last modified June 14 01:29 EDT 2021. Contains 345016 sequences. (Running on oeis4.)