A112593 -id:A112593 - cp's OEIS frontend

A160991 Row sums of triangle defined in A112593.

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

Offset: 1

Klaus Brockhaus, Jun 01 2009

nonn

			Fifth row is 7, 5, 5, 5, 0, 5, 5, 5, 5, so a(5) = 42.

Cf. A112593.

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 ];

A158805 a(3n) = A145511(n+1). a(3n+1) = A145501(n+1). a(3n+2) =A145444(n+1).

Original entry on oeis.org

1, 1, 1, 1, 3, 3, 3, 3, 3, 7, 7, 9, 3, 3, 3, 3, 9, 9, 3, 3, 3, 19, 13, 21, 6, 6, 6, 3, 9, 9, 3, 3, 3, 21, 21, 27, 3, 3, 3, 3, 9, 9, 9, 9, 9, 37, 25, 39, 3, 3, 3, 6, 18, 18, 3, 3, 3, 21, 21, 27, 9, 9, 9, 3, 9, 9, 3, 3, 3, 57, 39, 63, 6, 6, 6, 3, 9, 9, 10, 10, 10, 21, 21, 27, 3, 3, 3, 9, 27, 27, 3, 3, 3, 61

Offset: 0

Paul Curtz, Mar 27 2009

nonn

Why would one clump the three series in this way? [R. J. Mathar, Apr 08 2009]

Cf. A112593.

Edited and extended by R. J. Mathar, Apr 08 2009

cp's OEIS Frontend

A160991 Row sums of triangle defined in A112593.

Views

Author

Keywords

Examples

Crossrefs

Programs

Magma

A158805 a(3n) = A145511(n+1). a(3n+1) = A145501(n+1). a(3n+2) =A145444(n+1).

Views

Author

Keywords

Comments

Crossrefs

Extensions