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Search: id:A125571
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| A125571 |
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Least prime factor of the sum of n^k for k=0 to n-1. |
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+0
1
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| 3, 13, 5, 11, 7, 29, 3, 7, 11, 15797, 5, 53, 3, 11, 17, 10949, 7, 109912203092239643840221, 3
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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The sequence of largest prime factors of numbers generated by the same sum is probably identical to sequence A006486, since (n^n - 1)/(1 + n^2 + ... + n^(n-1)) = n-1.
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EXAMPLE
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The sum 1 + 4 + 4^2 + 4^3 = 85 = 5 x 17 so the third term is 5.
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CROSSREFS
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Cf. A006486.
Sequence in context: A122478 A128368 A050089 this_sequence A084738 A073580 A140445
Adjacent sequences: A125568 A125569 A125570 this_sequence A125572 A125573 A125574
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KEYWORD
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nonn
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AUTHOR
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Axel Harvey (ax(AT)hirsig.ca), Jan 02 2007
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