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Search: id:A121047
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| A121047 |
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a(0) = a(1) = 1; for n >= 2, a(n) = the n-th integer from among those positive integers which are coprime to a(n-1)+a(n-2). |
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4
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| 1, 1, 3, 5, 7, 13, 13, 15, 17, 17, 21, 23, 25, 37, 27, 29, 37, 53, 67, 71, 61, 67, 43, 61, 51, 57, 77, 53, 73, 101, 91, 91, 81, 67, 69, 73, 73, 75, 77, 81, 81, 121, 83, 137, 119, 89, 99, 95, 95, 127, 151, 101, 181, 161, 169, 227, 181, 179, 217, 193, 153, 121, 123, 127, 159
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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a(6)+a(7) = 28. 1,3,5,9,11,13,15,17,19,... is the sequence of positive integers which are coprime to 28. 17 is the 8th of these integers, so a(8) = 17.
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PROGRAM
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(PARI) {m=64; print1(c=1, ", ", b=1, ", "); for(n=2, m, k=n; s=c+b; a=0; while(k>0, a++; if(gcd(s, a)==1, k--)); print1(a, ", "); c=b; b=a)} - (Klaus Brockhaus, Aug 09 2006)
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CROSSREFS
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Adjacent sequences: A121044 A121045 A121046 this_sequence A121048 A121049 A121050
Sequence in context: A111745 A098957 A018205 this_sequence A092789 A092793 A024909
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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 08 2006
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 09 2006
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