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Search: id:A082132
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| A082132 |
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a(0) = 5; for n > 0, a(n) is the greatest prime factor of PP(a(n-1))*a(n-1)-2 where PP(n) is an abbreviation for PreviousPrime(n). |
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2
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| 5, 13, 47, 673, 1093, 4789, 15887, 6961, 7079, 1853387, 5636791, 16319158451, 46975091221, 97536826417, 9513432505744326182381, 2335222008886384800739, 7440517660385876970522347503153, 83914607657246408236765553419
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Some of the larger entries may only correspond to probable primes.
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PROGRAM
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(PARI) p=5; for(k=1, 20, print1(p, ", "); p=precprime(p-1)*p-2; f=factor(p); s=matsize(f)[1]; p=f[s, 1]) (Shepherd)
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CROSSREFS
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Cf. A082021, A031441, A031442.
Sequence in context: A060050 A120790 A025545 this_sequence A138277 A084601 A007231
Adjacent sequences: A082129 A082130 A082131 this_sequence A082133 A082134 A082135
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), May 10 2003
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EXTENSIONS
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Edited by Rick L. Shepherd (rshepherd2(AT)hotmail.com), Dec 19 2004
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