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Search: id:A124822
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| A124822 |
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a(n) = the n-th integer from among those positive integers which are coprime to n(n+1). |
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+0
2
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| 1, 5, 7, 9, 17, 19, 15, 23, 31, 27, 35, 37, 31, 59, 53, 33, 53, 55, 49, 83, 79, 49, 71, 89, 67, 83, 95, 67, 109, 113, 63, 103, 113, 103, 151, 109, 79, 127, 157, 101, 145, 149, 95, 179, 173, 97, 143, 167, 141, 197, 175, 113, 161, 223, 173, 199, 185, 121, 223, 227, 127, 223
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OFFSET
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1,2
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EXAMPLE
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The positive integers which are coprime to (5*6) are 1,7,11,13,17,19,23,29,...The fifth of these integers is 17, so a(5) = 17.
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MATHEMATICA
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f[n_] := Block[{k = 0, c = n}, While[c > 0, k++; While[GCD[n*(n + 1), k] > 1, k++ ]; c--; ]; k]; Table[f[n], {n, 65}] (*Chandler*)
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CROSSREFS
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Cf. A124823.
Sequence in context: A050595 A029667 A036708 this_sequence A072180 A024571 A068332
Adjacent sequences: A124819 A124820 A124821 this_sequence A124823 A124824 A124825
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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), Nov 08 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 10 2006
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