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Search: id:A094540
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| 6, 8, 6, 8, 6, 6, 8, 8, 6, 6, 8, 8, 6, 8, 8, 8, 6, 6, 6, 8, 6, 6, 6, 6, 6, 6, 6, 8, 8, 6, 8, 8, 6, 8, 6, 6, 6, 6, 6
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Conjecture: Ratio of 6's to 8's approaches 1.5 as a limit as this sequence approaches infinity - J. Lowell, jhbubby(AT)mindspring.com, Jun 26 2007
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LINKS
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Math Forum at Drexel, List of Perfect Numbers
Eric Weisstein's World of Mathematics, Perfect Number
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MAPLE
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(Maple code from N. J. A. Sloane (njas(AT)research.att.com)) # let s1 := list of terms in A000043
f:=n->if n mod 4 = 0 then 4 else n mod 4; fi; g:= x->2^f(x-1)*(2^f(x)-1); map(g, s1);
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MATHEMATICA
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p={ the list of the Mersenne exponents (A000043) }; Mod[(PowerMod[2, p, 10] - 1)(PowerMod[2, p - 1, 10]), 10] (from Robert G. Wilson v May 23 2004)
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CROSSREFS
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Cf. A000396. See A000043 for the present state of knowledge about Mersenne primes.
Sequence in context: A021597 A088751 A153627 this_sequence A010724 A065356 A019797
Adjacent sequences: A094537 A094538 A094539 this_sequence A094541 A094542 A094543
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KEYWORD
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nonn,hard,base
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com), May 08, 2004
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 01 2008, at the suggestion of Ant King and Omar Pol.
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