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Search: id:A082865
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| A082865 |
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a(n) is the sum of the preceding terms that are coprime to n. |
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+0
1
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| 1, 2, 3, 4, 10, 1, 21, 26, 44, 26, 94, 2, 182, 5, 382, 31, 834, 38, 1668, 57, 666, 119, 4216, 157, 8574, 395, 5735, 6385, 29678, 309, 49683, 62902, 80713, 143496, 320705, 414247, 1125010, 878510, 2929386, 545342, 6609659, 507670, 7117329, 14284850
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(6)=1 as 2,3,4 and 10 all have gcd(6,x)>1.
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PROGRAM
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(PARI) { v=vector(100, i, 0); v[1]=1; v[2]=2; print1("1, 2, "); for (i=3, 100, for (j=1, i-1, if (gcd(i, v[j]) == 1, v[i]+=v[j])); print1(v[i]", ")) }
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CROSSREFS
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Sequence in context: A076018 A076017 A135112 this_sequence A158929 A140598 A129920
Adjacent sequences: A082862 A082863 A082864 this_sequence A082866 A082867 A082868
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), May 24 2003
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