| 15, 21, 33, 35, 39, 51, 55, 57, 65, 69, 77, 85, 87, 91, 93, 95, 105, 111, 115, 119, 123, 129, 133, 141, 143, 145, 155, 159, 161, 165, 177, 183, 185, 187, 195, 201, 203, 205, 209, 213, 215, 217, 219, 221, 231, 235, 237, 247, 249, 253, 255, 259, 265, 267, 273
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Composite numbers n such that sum(k=1,n-1,floor(k^3/n)) = (1/4)*(n-2)*(n^2-1) (equality holds also for all primes) - Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 08 2002
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LINKS
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Zak Seidov, Table of n, a(n) for n = 1..11999.
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Eric Weisstein's World of Mathematics, Prime Sums
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CROSSREFS
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Cf. A046388, A078837.
Sequence in context: A070005 A061346 A098905 this_sequence A046388 A056913 A002557
Adjacent sequences: A024553 A024554 A024555 this_sequence A024557 A024558 A024559
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KEYWORD
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nonn,easy
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AUTHOR
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njas, May 22 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), May 22 2000
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