|
| |
|
|
A094540
|
|
Last digit of perfect number A000396(n).
|
|
6
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| 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
|
|
|
LINKS
| Math Forum at Drexel, List of Perfect Numbers
Eric Weisstein's World of Mathematics, Perfect Number
|
|
|
MAPLE
| (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);
|
|
|
MATHEMATICA
| 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)
|
|
|
CROSSREFS
| Cf. A000396. See A000043 for the present state of knowledge about Mersenne primes.
Sequence in context: A200326 A088751 A153627 * A010724 A196822 A065356
Adjacent sequences: A094537 A094538 A094539 * A094541 A094542 A094543
|
|
|
KEYWORD
| nonn,hard,base
|
|
|
AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), May 08, 2004
|
|
|
EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 01 2008, at the suggestion of Ant King and Omar Pol.
|
| |
|
|
