The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A160991 Row sums of triangle defined in A112593. 1
 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; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE Fifth row is 7, 5, 5, 5, 0, 5, 5, 5, 5, so a(5) = 42. PROG (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 ]; CROSSREFS Cf. A112593. Sequence in context: A276938 A046280 A046283 * A328387 A006872 A027179 Adjacent sequences: A160988 A160989 A160990 * A160992 A160993 A160994 KEYWORD nonn AUTHOR Klaus Brockhaus, Jun 01 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 20 16:03 EDT 2023. Contains 361386 sequences. (Running on oeis4.)