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A046060 5-multiperfect numbers. 11
14182439040, 31998395520, 518666803200, 13661860101120, 30823866178560, 740344994887680, 796928461056000, 212517062615531520, 69357059049509038080, 87934476737668055040, 170206605192656148480 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Contribution from Daniel Forgues (squid(AT)zensearch.com), May 09 2010: (Start)

Example:

14182439040 = 2^7*3^4*5*7*11^2*17*19

sigma(14182439040) = (2^8-1)/1*(3^5-1)/2*(5^2-1)/4*(7^2-1)/6*(11^3-1)/10*(17^2-1)/16*(19^2-1)/18

= (255)*(121)*(6)*(8)*(133)*(18)*(20)

= (3*5*17)*(11^2)*(2*3)*(2^3)*(7*19)*(2*3^2)*(2^2*5)

= 2^7*3^4*5^2*7*11^2*17*19

= (5) * (2^7*3^4*5*7*11^2*17*19)

= 5 * 14182439040 (End)

LINKS

T. D. Noe, Table of n, a(n) for n=1..65 (complete sequence)

Walter Nissen, Abundancy : Some Resources

Achim Flammenkamp, The Multiply Perfect Numbers Page

Fred Helenius, Link to Glossary and Lists

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

CROSSREFS

Cf. A000396, A005820, A027687, A046061, A007539.

Sequence in context: A017484 A017616 A134298 * A172595 A172617 A038545

Adjacent sequences:  A046057 A046058 A046059 * A046061 A046062 A046063

KEYWORD

nonn,fini

AUTHOR

Eric Weisstein (eric(AT)weisstein.com)

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.