The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A307356 a(n) is the numbers of 2's in row n of triangle A307239. 2
 0, 0, 1, 0, 2, 2, 3, 0, 2, 0, 2, 2, 8, 6, 5, 0, 2, 2, 7, 8, 13, 12, 13, 8, 9, 6, 11, 8, 11, 8, 7, 0, 4, 2, 7, 10, 21, 20, 29, 24, 25, 22, 27, 24, 27, 24, 23, 16, 19, 14, 17, 20, 27, 28, 35, 24, 23, 22, 25, 22, 25, 16, 13, 0, 6, 12, 23, 32, 43, 44, 57, 56, 57 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Rémy Sigrist, Table of n, a(n) for n = 0..8192 FORMULA a(n) <= A048967(n). a(2^k - 1) = 0 for any k >= 0. EXAMPLE The first terms, alongside the corresponding rows in A307239, are: n a(n) Row n of A307239 -- ---- ------------------------------------------ 0 0 1 1 0 1 1 2 1 1 2 1 3 0 1 3 3 1 4 2 1 2 6 2 1 5 2 1 3 2 2 3 1 6 3 1 2 5 2 5 2 1 7 0 1 3 7 7 7 7 3 1 8 2 1 2 10 14 14 14 10 2 1 9 0 1 3 6 6 14 14 6 6 3 1 10 2 1 2 3 6 10 14 10 6 3 2 1 PROG (PARI) rad(n) = my (p=factor(n)[, 1]~); prod(i=1, #p, p[i]) { for (r=0, 72, row = vector(r+1, k, if ( k==1||k==r+1, 1, rad(row[k-1]+row[k]))); print1 (sum(k=1, r+1, row[k]==2) ", ")) } CROSSREFS Cf. A048967, A307239. Sequence in context: A303545 A306191 A290125 * A091426 A053761 A138067 Adjacent sequences: A307353 A307354 A307355 * A307357 A307358 A307359 KEYWORD nonn AUTHOR Rémy Sigrist, Apr 03 2019 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 May 27 16:57 EDT 2024. Contains 372880 sequences. (Running on oeis4.)