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Search: id:A001265
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| A001265 |
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Table T(n,k) in which n-th row lists prime factors of 2^n - 1 (n >= 2), with repetition. |
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+0
5
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| 0, 1, 3, 7, 3, 5, 31, 3, 3, 7, 127, 3, 5, 17, 7, 73, 3, 11, 31, 23, 89, 3, 3, 5, 7, 13, 8191, 3, 43, 127, 7, 31, 151, 3, 5, 17, 257, 131071, 3, 3, 3, 7, 19, 73, 524287, 3, 5, 5, 11, 31, 41, 7, 7, 127, 337, 3, 23, 89, 683, 47, 178481, 3, 3, 5, 7, 13, 17, 241
(list; table; graph; listen)
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OFFSET
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0,3
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COMMENT
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For n>1, the length of row n is A046051(n). - T. D. Noe (noe(AT)sspectra.com), Aug 06 2007
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REFERENCES
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J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
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LINKS
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T. D. Noe, Rows n=0..500 of triangle, flattened (derived from Brillhart et al.)
Joerg Arndt, Rows n=1..1200 of triangle (derived from Brillhart et al.)
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
Jeroen Demeyer, Machine-readable Cunningham Tables
S. S. Wagstaff, Jr., The Cunningham Project
Eric Weisstein's World of Mathematics, Mersenne Number
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EXAMPLE
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0; 1; 3; 7; 3,5; 31; 3,3,7; 127; 3,5,17; ...
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CROSSREFS
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Cf. A060443.
Sequence in context: A101636 A096247 A122583 this_sequence A060443 A020810 A021732
Adjacent sequences: A001262 A001263 A001264 this_sequence A001266 A001267 A001268
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KEYWORD
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nonn,tabl
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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