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Search: id:A001269
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| A001269 |
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Table T(n,k) in which n-th row lists prime factors of 2^n + 1 (n >= 0), with repetition. |
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+0
8
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| 2, 3, 5, 3, 3, 17, 3, 11, 5, 13, 3, 43, 257, 3, 3, 3, 19, 5, 5, 41, 3, 683, 17, 241, 3, 2731, 5, 29, 113, 3, 3, 11, 331, 65537, 3, 43691, 5, 13, 37, 109, 3, 174763, 17, 61681, 3, 3, 43, 5419, 5, 397, 2113, 3, 2796203, 97, 257, 673, 3, 11, 251, 4051
(list; table; graph; listen)
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OFFSET
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0,1
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COMMENT
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Rows have irregular lengths.
The length of row n is A054992(n).
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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.)
S. S. Wagstaff, Jr., The Cunningham Project
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
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EXAMPLE
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2; 3; 5; 3,3,17; 3,11; 5,13; 3,43; 257; ...
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CROSSREFS
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Cf. A060444.
Sequence in context: A072751 A131971 A100742 this_sequence A077276 A073684 A083776
Adjacent sequences: A001266 A001267 A001268 this_sequence A001270 A001271 A001272
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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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