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A023572 Exponent of 2 in prime factorization of prime(n)-3. 1
0, 0, 1, 2, 3, 1, 1, 4, 2, 1, 2, 1, 1, 3, 2, 1, 3, 1, 6, 2, 1, 2, 4, 1, 1, 1, 2, 3, 1, 1, 2, 7, 1, 3, 1, 2, 1, 5, 2, 1, 4, 1, 2, 1, 1, 2, 4, 2, 5, 1, 1, 2, 1, 3, 1, 2, 1, 2, 1, 1, 3, 1, 4, 2, 1, 1, 3, 1, 3, 1, 1, 2, 2, 1, 3, 2, 1, 1, 1, 1, 5, 1, 2, 1, 2, 3, 1, 1, 1, 2, 4, 2, 2, 3, 4, 2, 1, 1, 3 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

PROG

(PARI) twos(n) = if(n%2==1||n<1, 0, twos(n/2)+1)

A023572(n) = twos(prime(n)-3)

CROSSREFS

Sequence in context: A139343 A059247 A194518 * A023570 A011249 A002784

Adjacent sequences:  A023569 A023570 A023571 * A023573 A023574 A023575

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

EXTENSIONS

First two terms corrected by Michael B. Porter (michael_b_porter(AT)yahoo.com), Feb 03 2010

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.