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Search: id:A145097
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| A145097 |
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a(n) = largest divisor of the Mersenne composite A065341(n) |
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+0
4
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| 89, 178481, 2304167, 616318177, 164511353, 20408568497, 59862819377, 1416003655831, 3203431780337, 761838257287, 10334355636337793, 21514198099633918969, 224958284260258499201, 57912614113275649087721
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OFFSET
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1,1
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COMMENT
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Note that not all the largest divisors are primes.
Which divisors are prime? - see A145099. [From Artur Jasinski (grafix(AT)csl.pl), Oct 04 2008]
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MATHEMATICA
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a = {}; Do[m = 2^Prime[n] - 1; If[PrimeQ[m], null, AppendTo[a, Divisors[m][[ -2]]]], {n, 1, 40}]; a (*Artur Jasinski*)
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CROSSREFS
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A065341, A135975, A135980, A145098
Sequence in context: A089158 A136031 A145098 this_sequence A080051 A072314 A087538
Adjacent sequences: A145094 A145095 A145096 this_sequence A145098 A145099 A145100
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 01 2008
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