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Search: id:A119676
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| A119676 |
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a(0)=1. a(n) = n-th integer from among those positive integers which are coprime to the product of the earlier terms of the sequence. |
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+0
1
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| 1, 1, 2, 5, 9, 17, 23, 31, 41, 47, 53, 61, 71, 77, 101, 107, 113, 131, 139, 151, 163, 169, 181, 193, 199, 223, 229, 239, 251, 263, 271, 281, 293, 311, 317, 337, 349, 359, 367, 379, 389, 401, 419, 431, 439, 449, 461, 467, 487, 499, 509, 523, 547, 557, 569, 577
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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10 is the product of terms a(0) through a(3). 1,3,7,9,11,...is the sequence of positive integers coprime to 10. 9 is the 4th term of this sequence, so a(4) therefore is 9.
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PROGRAM
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(PARI) {m=56; print1(1, ", "); s=1; for(n=1, 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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Adjacent sequences: A119673 A119674 A119675 this_sequence A119677 A119678 A119679
Sequence in context: A039946 A130752 A059529 this_sequence A036711 A080740 A123324
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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 04 2006
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EXTENSIONS
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Corrected and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 15 2006
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