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A060444
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Table T(n,k) in which n-th row lists prime factors of 2^n + 1 (n >= 0), without repetition.
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3
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2, 3, 5, 3, 17, 3, 11, 5, 13, 3, 43, 257, 3, 19, 5, 41, 3, 683, 17, 241, 3, 2731, 5, 29, 113, 3, 11, 331, 65537, 3, 43691, 5, 13, 37, 109, 3, 174763, 17, 61681, 3, 43, 5419, 5, 397, 2113, 3, 2796203, 97, 257, 673, 3, 11, 251, 4051
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Rows have irregular lengths.
The length of row n is A046799(n).
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REFERENCES
| 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
| 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
| 2; 3; 5; 3,17; 3,11; 5,13; 3,43; 257; ...
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MATHEMATICA
| Flatten[Table[Transpose[FactorInteger[2^n+1]][[1]], {n, 0, 25}]] (* From Harvey P. Dale, Aug 10 2011 *)
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CROSSREFS
| Cf. A001269.
Sequence in context: A051358 A107473 A113222 * A152814 A021981 A068508
Adjacent sequences: A060441 A060442 A060443 * A060445 A060446 A060447
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KEYWORD
| nonn,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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