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Search: id:A060954
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| A060954 |
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Largest prime factor of 10*n + 1. |
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+0
1
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| 11, 7, 31, 41, 17, 61, 71, 3, 13, 101, 37, 11, 131, 47, 151, 23, 19, 181, 191, 67, 211, 17, 11, 241, 251, 29, 271, 281, 97, 43, 311, 107, 331, 31, 13, 19, 53, 127, 23, 401, 137, 421, 431, 7, 41, 461, 157, 37, 491, 167, 73, 521, 59, 541, 29, 17, 571, 83, 197, 601, 47
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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21 = 3*7, so a(3)=7.
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MATHEMATICA
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Table[First[Last[FactorInteger[10n + 1]]], {n, 1, 80}]
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PROGRAM
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(PARI) { for (n=1, 1000, f=factor(10*n + 1)~; write("b060954.txt", n, " ", f[1, length(f)]); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 19 2009]
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CROSSREFS
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Sequence in context: A144262 A110093 A166521 this_sequence A038321 A002749 A055505
Adjacent sequences: A060951 A060952 A060953 this_sequence A060955 A060956 A060957
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KEYWORD
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nonn
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AUTHOR
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J. Lowell (jhbubby(AT)mindspring.com), May 08 2001
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EXTENSIONS
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More terms from Reiner Martin (reinermartin(AT)hotmail.com), Jul 07 2001
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