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Search: id:A121640
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| A121640 |
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a(1) = 1. a(n) = a(n-1) + (nth integer from among those positive integers which are coprime to a(n-1)). |
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+0
2
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| 1, 3, 7, 11, 16, 27, 37, 45, 61, 71, 82, 105, 134, 161, 178, 209, 227, 245, 272, 313, 334, 377, 401, 425, 457, 483, 533, 563, 592, 653, 684, 785, 826, 907, 942, 1049, 1086, 1199, 1241, 1283, 1324, 1407, 1483, 1527, 1594, 1685, 1743, 1828, 1925, 2004, 2155, 2219
(list; graph; listen)
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OFFSET
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1,2
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PROGRAM
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(PARI) {m=52; print1(b=1, ", "); for(n=2, m, k=n; c=0; while(k>0, c++; if(gcd(b, c)==1, k--)); print1(a=b+c, ", "); b=a)} - (Klaus Brockhaus, Aug 14 2006)
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CROSSREFS
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Cf. A121641, A121047.
Adjacent sequences: A121637 A121638 A121639 this_sequence A121641 A121642 A121643
Sequence in context: A131024 A053982 A118000 this_sequence A112786 A023211 A038981
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Aug 12 2006
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 14 2006
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