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Search: id:A130700
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| A130700 |
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a(0)=1. a(n) = n-th integer from among those positive integers which are coprime to (a(n-1)*n). |
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1
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| 1, 1, 3, 4, 7, 6, 17, 8, 15, 16, 23, 12, 35, 19, 33, 31, 33, 29, 55, 27, 73, 37, 49, 27, 71, 31, 57, 43, 67, 30, 109, 32, 63, 64, 71, 51, 113, 38, 79, 62, 103, 42, 145, 56, 111, 88, 105, 106, 145, 73, 127
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OFFSET
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0,3
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EXAMPLE
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a(8)*9 = 135. Those positive integers which are coprime to 135 form the sequence: 1,2,4,7,8,11,13,14,16,17,19,22,...The 9th of these integers is 16; so a(9) = 16.
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MAPLE
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a[0]:=1: for n to 50 do CP:={}: for j while nops(CP)<=n do if gcd(n*a[n-1], j) =1 then CP:=`union`(CP, {j}) else end if end do: a[n]:=CP[n] end do: seq(a[n], n=0..50); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 28 2007
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CROSSREFS
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Cf. A069213.
Sequence in context: A053480 A077580 A069213 this_sequence A117134 A095001 A068905
Adjacent sequences: A130697 A130698 A130699 this_sequence A130701 A130702 A130703
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Aug 12 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 28 2007
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