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Search: id:A053850
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| A053850 |
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Odd n divisible by a square > 1. |
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+0
1
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| 9, 25, 27, 45, 49, 63, 75, 81, 99, 117, 121, 125, 135, 147, 153, 169, 171, 175, 189, 207, 225, 243, 245, 261, 275, 279, 289, 297, 315, 325, 333, 343, 351, 361, 363, 369, 375, 387, 405, 423, 425, 441, 459, 475, 477, 495, 507, 513, 525, 529, 531, 539, 549, 567
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Odd n such that sum(k=1,n-1,floor(k^3/n)) is different from (1/4)*(n-2)*(n^2-1) (equality holds for n prime as well as for "1" union "A024556" ) - Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 08 2002
Odd not-square-free numbers, odd bisection of A013929. - Zak Seidov, Aug 16 2006
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LINKS
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Eric Weisstein's World of Mathematics, Prime Sums
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CROSSREFS
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Cf. A078837.
Cf. A078837, A013929.
Sequence in context: A086531 A089091 A155109 this_sequence A020210 A062739 A075109
Adjacent sequences: A053847 A053848 A053849 this_sequence A053851 A053852 A053853
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Mar 28 2000
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