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A091283 Exponent of 2 in -1+prime[n]^s, if s is an exponent of the form s=8k-4. 1
0, 4, 4, 5, 4, 4, 6, 4, 5, 4, 7, 4, 5, 4, 6, 4, 4, 4, 4, 5, 5, 6, 4, 5, 7, 4, 5, 4, 4, 6, 9, 4, 5, 4, 4, 5, 4, 4, 5, 4, 4, 4, 8, 8, 4, 5, 4, 7, 4, 4, 5, 6, 6, 4, 10, 5, 4, 6, 4, 5, 4, 4, 4, 5, 5, 4, 4, 6, 4, 4, 7, 5, 6, 4, 4, 9, 4, 4, 6, 5, 4, 4, 6, 6, 5, 4, 8, 5, 4, 6, 4, 7, 5, 4, 4, 5, 4, 5, 4, 4, 4, 4, 4, 5, 4 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

MATHEMATICA

Table[{8*k-4, Table[Part[Flatten[FactorInteger [ -1+Prime[n]^(8*k-4)]], 2], {n, 2, m}]}, {k, 1, 2}]

CROSSREFS

Cf. A091282, A090739, A090740, A090129, A023506.

Sequence in context: A011333 A016709 A023403 * A161758 A046566 A046593

Adjacent sequences:  A091280 A091281 A091282 * A091284 A091285 A091286

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Jan 22 2004

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Last modified February 13 16:42 EST 2012. Contains 205523 sequences.