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Search: id:A131347
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| A131347 |
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a(1)=1. a(n) = a(n-1) + (sum of the terms, from among terms a(1) through a(n-1), which are coprime to sum{k=1 to n-1} a(k)). |
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| 1, 2, 5, 11, 30, 79, 175, 448, 1199, 2489, 6928, 18265, 40489, 110610, 291341, 645395, 1633957, 2615141, 7207226, 19135622, 50845035, 106938617, 244812167, 652656533, 1686364826, 3755787245, 4816287969, 12353991673, 29473426455
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OFFSET
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1,2
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EXAMPLE
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The sum of the first 6 terms of the sequence is 128. There are 4 terms from among the first 6 terms of the sequence that are coprime to 128 (a(1)=1, a(3)=5, a(4)=11, a(6)=79). So a(7)= a(6) + 1 + 5 + 11 + 79 = 175.
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CROSSREFS
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Cf. A131346.
Sequence in context: A092764 A059075 A121134 this_sequence A079225 A139466 A139467
Adjacent sequences: A131344 A131345 A131346 this_sequence A131348 A131349 A131350
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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), Jul 01 2007
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EXTENSIONS
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More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Jul 18 2007
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