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Search: id:A064605
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| A064605 |
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Partial sum of Sigma_2(n) is divisible by n, where Sigma_2(n)=A001157(n). |
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+0
7
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| 1, 2, 8, 74, 146, 150, 158, 307, 526, 541, 16157, 20289, 271343, 953614
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OFFSET
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1,2
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COMMENT
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Analogous sequences for various arithmetical functions are A050226, A056650, A064605-A064607, A064610, A064611, A048290, A062982, A045345.
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FORMULA
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Mod[Sum{sigma_2(j), j=1..n}, n]=Mod[A064602(n), n]=0
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EXAMPLE
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Summarizing divisor-square sums for j=1,...,8 gives 1+5+10+21+26+50+50+85=248, which is divisible by n=8, so 8 is here and the integer quotient is 31.
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CROSSREFS
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A001157, A064602 A050226, A056650, A064605-A064607, A064610-A064612, A048290, A062982, A045345.
Sequence in context: A013002 A012998 A143760 this_sequence A132039 A002668 A093062
Adjacent sequences: A064602 A064603 A064604 this_sequence A064606 A064607 A064608
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 24 2001
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