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Search: id:A094474
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| A094474 |
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a(n) is the largest prime factor of 2^n+3^n. |
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+0
6
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| 5, 13, 7, 97, 11, 61, 463, 401, 577, 4621, 35839, 5521, 4057, 369181, 241, 14177, 7039, 181, 555029, 3121, 92233, 2414250301, 13249, 41432641, 513101, 13761229, 377604937, 3001769, 148466603, 24001, 22674269, 1607133116929, 22270249
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OFFSET
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1,1
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EXAMPLE
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n=100, 2^100+3^100=41.97.281.3121.742801.20017001.9937984196743741414107401 so a[100]=9937984196743741414107401.
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MATHEMATICA
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Table[Part[Reverse[Flatten[FactorInteger[2^w + 3^w]]], 2], {w, 1, 100}]
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CROSSREFS
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Sequence in context: A068530 A088315 A138296 this_sequence A064109 A156682 A089534
Adjacent sequences: A094471 A094472 A094473 this_sequence A094475 A094476 A094477
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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), Jun 01 2004
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