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Search: id:A070299
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| A070299 |
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Numbers n such that the equation sigma(n+x)=sigma(n-x) for x=1,2,3,4,..,n-1 has solution. |
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+0
1
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| 19, 23, 26, 31, 34, 38, 40, 41, 49, 52, 53, 55, 61, 63, 68, 69, 73, 74, 75, 76, 80, 82, 83, 85, 91, 96, 101, 103, 104, 106, 110, 112, 113, 117, 122, 123, 126, 130, 131, 133, 136, 145, 146, 147, 148, 149, 151, 152, 155, 156, 157, 158, 160, 161, 162, 163, 164, 166
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) for(n=1, 200, if(0<sum(i=1, n-1, if(sigma(n+i)-sigma(n-i), 0, 1)), print1(n, ", ")))
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CROSSREFS
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Sequence in context: A050955 A072305 A095222 this_sequence A159021 A100460 A166061
Adjacent sequences: A070296 A070297 A070298 this_sequence A070300 A070301 A070302
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 10 2002
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