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Search: id:A121528
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| A121528 |
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a(1)=1. a(n) = n-th integer from among those positive integers which are coprime to the sum of the previous terms of this sequence. |
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+0
2
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| 1, 2, 4, 4, 5, 11, 10, 8, 16, 10, 11, 23, 29, 27, 17, 31, 18, 18, 27, 41, 21, 43, 24, 24, 32, 26, 50, 30, 29, 61, 31, 101, 41, 81, 35, 107, 37, 113, 42, 42, 41, 83, 76, 44, 67, 91, 58, 85, 97, 79, 151, 64, 61, 211, 57, 139, 57, 135, 59, 131, 103, 135, 63, 159, 65, 197, 71
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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45 = the sum of the terms a(1) to a(8), 45 = 1+2+4+4+5+11+10+8. 1,2,4,7,8,11,13,14,16,17... are the positive integers which are coprime to 45. 16 is the 9th of these integers, so a(9) = 16.
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PROGRAM
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(PARI) {m=67; print1(1, ", "); s=1; for(n=2, m, k=n; c=0; while(k>0, c++; if(gcd(s, c)==1, k--)); print1(c, ", "); s=s+c)} - (Klaus Brockhaus, Aug 15 2006)
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CROSSREFS
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Cf. A121527.
Sequence in context: A132128 A084824 A151969 this_sequence A160904 A049782 A091666
Adjacent sequences: A121525 A121526 A121527 this_sequence A121529 A121530 A121531
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Aug 05 2006
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 15 2006
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