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Search: id:A064607
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| A064607 |
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Partial sum of Sigma_4(n) is divisible by n, where Sigma_4(n)=A001159(n). |
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+0
7
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| 1, 2, 7, 151, 257, 1823, 3048, 5588, 6875, 7201, 8973, 24099
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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_4(j), j=1..n}, n]=Mod[A064604(n), n]=0
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EXAMPLE
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Adding 4th-power divisor-sums for j=1,...,7 gives 1+17+82+273+626+1394+2402=4795 which is divisible by n=7, so 7 is here and the integer quotient is 655.
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CROSSREFS
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A001159, A064604 A050226, A056650, A064605-A064607, A064610-A064612, A048290, A062982, A045345.
Sequence in context: A120379 A101799 A062617 this_sequence A005345 A077746 A159034
Adjacent sequences: A064604 A064605 A064606 this_sequence A064608 A064609 A064610
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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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