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A091282 Exponent of 2 in prime(n)^2 - 1. 3
0, 3, 3, 4, 3, 3, 5, 3, 4, 3, 6, 3, 4, 3, 5, 3, 3, 3, 3, 4, 4, 5, 3, 4, 6, 3, 4, 3, 3, 5, 8, 3, 4, 3, 3, 4, 3, 3, 4, 3, 3, 3, 7, 7, 3, 4, 3, 6, 3, 3, 4, 5, 5, 3, 9, 4, 3, 5, 3, 4, 3, 3, 3, 4, 4, 3, 3, 5, 3, 3, 6, 4, 5, 3, 3, 8, 3, 3, 5, 4, 3, 3, 5, 5, 4, 3, 7, 4, 3, 5, 3, 6, 4, 3, 3, 4, 3, 4, 3, 3, 3, 3, 3, 4, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also, exponent of 2 in -1+prime(n)^s if s is an exponent of the form 4k+2 (previous definition). - Michel Marcus, Dec 20 2013

Primes that give records for this sequence can be found in A233930. - Michel Marcus, Dec 20 2013

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

a(1)=0 since -1+2^s is always odd...

PROG

(PARI) a(n) = valuation(prime(n)^2-1, 2); \\ Michel Marcus, Dec 20 2013

CROSSREFS

Cf. A007814, A023506, A091283, A091284.

Sequence in context: A080038 A121937 A003034 * A202708 A027684 A276864

Adjacent sequences:  A091279 A091280 A091281 * A091283 A091284 A091285

KEYWORD

nonn

AUTHOR

Labos Elemer, Jan 20 2004

EXTENSIONS

Definition modified by Michel Marcus, Dec 20 2013

STATUS

approved

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Last modified October 20 20:24 EDT 2019. Contains 328273 sequences. (Running on oeis4.)