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Search: id:A080431
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| A080431 |
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Even numbers such that all a(i)*a(j) are distinct. |
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+0
3
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| 2, 4, 6, 8, 10, 14, 18, 22, 26, 32, 34, 38, 46, 50, 58, 60, 62, 74, 82, 86, 94, 98, 106, 118, 122, 134, 142, 146, 158, 162, 166, 168, 178, 194, 202, 206, 214, 218, 226, 242, 254, 256, 262, 274, 278, 298, 302, 308, 314, 326, 334, 338, 346, 358, 360, 362, 382, 386
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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S := {8}: A := array(1..10^3): for m from 1 to 10^3 do A[m] := 0 od: A[2] := 2: A[4] := 4: for n from 6 to 10^3 by 2 do mytest := 0: for j from 2 to n-2 by 2 do if A[j]>0 then if member(A[j]*n, S) then mytest := 1; break; fi: fi: od: if mytest=0 then A[n] := n; for j from 2 to n-2 by 2 do S := S union {A[j]*n} od: fi: od: for i from 2 to 10^3 by 2 do if A[i]>0 then printf(`%d, `, A[i]) fi: od:
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CROSSREFS
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Cf. A080430, A080432.
Equals 2*A066724.
Sequence in context: A151566 A160406 A113293 this_sequence A122642 A161562 A102470
Adjacent sequences: A080428 A080429 A080430 this_sequence A080432 A080433 A080434
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 20 2003
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EXTENSIONS
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More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 26, 2003
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