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Search: id:A046840
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| A046840 |
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Number of divisors divides sum of 4th powers of divisors. |
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+0
1
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| 1, 3, 4, 5, 7, 11, 12, 13, 15, 16, 17, 19, 20, 21, 23, 25, 27, 28, 29, 31, 33, 35, 37, 39, 41, 43, 44, 47, 48, 49, 51, 52, 53, 55, 57, 59, 60, 61, 65, 67, 68, 69, 71, 73, 75, 76, 77, 79, 80, 81, 83, 84, 85, 87, 89, 91, 92, 93, 95, 97, 100, 101, 103, 105, 107, 108, 109, 111
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Below 1000 the {16,80,81,176,304,324,400,405,464,496,656,784,880,891,944,976} are those numbers which enclosed here but not in A020486, which otherwise is very similar to this sequence.
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EXAMPLE
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x=16 with 5 divisors, sigma[ k,16 ] = 5,31,341,46801,69905 for k=0,1,2,3,4 resp. It is seen that sigma[ 4,16 ]=13981*sigma[ 0,64 ]=41*sigma[ 2,64 ]*sigma[ 0,64 ].
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CROSSREFS
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A020486, A003601.
Adjacent sequences: A046837 A046838 A046839 this_sequence A046841 A046842 A046843
Sequence in context: A003312 A022440 A088130 this_sequence A057773 A020486 A091428
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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)
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