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Search: id:A091284
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| A091284 |
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Exponent of 2 in -1+prime[n]^s, if s is an exponent of form 16k-8. Except a(1)=0, a(n)=1+A091283(n). |
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+0
2
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| 0, 5, 5, 6, 5, 5, 7, 5, 6, 5, 8, 5, 6, 5, 7, 5, 5, 5, 5, 6, 6, 7, 5, 6, 8, 5, 6, 5, 5, 7, 10, 5, 6, 5, 5, 6, 5, 5, 6, 5, 5, 5, 9, 9, 5, 6, 5, 8, 5, 5
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OFFSET
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1,2
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COMMENT
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Exponents of 2 in -1+p^s if the exponent s[u]=(2^u)k-(2^(u-1) comes from other sequence generated with s[u-1] exponent by adding 1 to terms of the "previous" sequence. E.g. s=256k-128 needed an addition of 6 to the terms of A091282.
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MATHEMATICA
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Table[{8*k-4, Table[Part[Flatten[FactorInteger [ -1+Prime[n]^(16*k-8)]], 2], {n, 2, 50}]}, {k, 1, 2}]
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CROSSREFS
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Cf. A023506, A007814, A091282, A091283, A090739, A090740, A090129.
Sequence in context: A019162 A024951 A092519 this_sequence A046604 A106746 A010486
Adjacent sequences: A091281 A091282 A091283 this_sequence A091285 A091286 A091287
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jan 22 2004
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