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Search: id:A160991
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| 1, 3, 15, 25, 42, 74, 96, 126, 156, 177, 268, 393, 293, 527, 573, 732, 623, 772, 887, 903, 1029, 1010, 1333, 1398, 1353, 1594, 2104, 1786, 1923, 1971, 2847, 2744, 2560, 2282, 3128, 3133, 2850, 3634, 3795, 2976, 4212, 4092, 4413, 4596, 4605, 4679, 6177, 5158
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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Fifth row is 7, 5, 5, 5, 0, 5, 5, 5, 5, so a(5) = 42.
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PROGRAM
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(MAGMA) S:=[[1]]; for i in [2..48] do Append(~S, [ &+[ Gcd(S[i-1][k], j) eq 1 select 1 else 0: k in [1..2*i-3] ]: j in [1..2*i-1] ]); end for; [ &+R: R in S ];
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CROSSREFS
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Cf. A112593.
Sequence in context: A018982 A046280 A046283 this_sequence A006872 A027179 A121250
Adjacent sequences: A160988 A160989 A160990 this_sequence A160992 A160993 A160994
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jun 01 2009
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