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Search: id:A064112
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| A064112 |
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Numbers n such that sopf(n) = 2*sopf(n+1), where sopf(n)=A008472. |
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+0
1
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| 99, 155, 689, 1106, 1517, 1524, 3014, 3403, 3479, 5809, 6478, 6723, 8606, 9143, 9454, 9797, 10126, 11771, 12283, 12382, 13112, 13969, 14150, 17422, 19303, 22184, 24856, 27466, 28119, 28529, 35927, 36464, 37512, 41904, 44505, 45016, 45506
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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sopf(689)=66, 2*sopf(690)=66.
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PROGRAM
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(PARI) sopf(n, s, fac, i) = fac=factor(n); for(i=1, matsize(fac)[1], s=s+fac[i, 1]); return(s); j=[]; for(n=1, 50000, if(sopf(n)==2*sopf(n+1), j=concat(j, n))); j
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CROSSREFS
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Sequence in context: A045298 A039446 A095420 this_sequence A126230 A055164 A075815
Adjacent sequences: A064109 A064110 A064111 this_sequence A064113 A064114 A064115
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Sep 08 2001
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