The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A143349 Triangle read by rows, A000012 * A054524 = A000012 * A051731 * A128407; 1<=k<=n. 2
 1, 2, -1, 3, -1, -1, 4, -2, -1, 0, 5, -2, -1, 0, -1, 6, -3, -2, 0, -1, 1, 7, -3, -2, 0, -1, 1, -1, 8, -4, -2, 0, -1, 1, -1, 0, 9, -4, -4, 0, -1, 1, -1, 0, 10, -5, -3, 0, -2, 1, -1, 0, 0, 1, 11, -5, -3, 0, -2, 1, -1, 0, 0, 1, -1, 12, -6, -4, 0, -2, 2, -1, 0, 0, 1, -1, 0, 13, -6, -4, 0, -2, 2, -1, 0, 0, 1, -1, 0, -1, 14, -7, -4, 0, -2, 2, -2, 0, 0, 1, -1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The triangle acts as a transform converting any sequence S(k) into a triangle with row sums = S(k). By way of example, begin with S(k), the primes: (2, 3, 5, 7, 11,...). Add (0, 1, 2, 3, 4,...) to the sequence getting (p(n)+(n-1)) 2, 4, 7, 10, 15, 18, 23, 36, 31,...) = sequence Q(k). Then replace column 1 (1, 2, 3,...) of triangle A143349 with sequence Q(k). This = triangle A143350 with row sums p(n): 2; 4, -1; 7, -1, -1; 10, -2, -1, 0; ... LINKS FORMULA Triangle read by rows, A000012 * A054524 = A000012 * A051731 * A128407; 1<=k<=n. The A000012 multiplier takes partial sums of A054524 column terms. A051731 is the inverse Mobius transform and A128407 = an infinite lower triangular matrix with mu(n) in the main diagonal and the rest zeros. EXAMPLE First few rows of the triangle = 1; 2, -1; 3, -1, -1; 4, -2, -1, 0; 5, -2, -1, 0, -1; 6, -3, -2, 0, -1, 1; 7, -3, -2, 0, -1, 1, -1; 8, -4, -2, 0, -1, 1, -1, 0 9, -4, -3, 0, -1, 1, -1, 0, 0; 10, -5, -3, 0, -2, 1, -1, 0, 0, 1; 11, -5, -3, 0, -2, 1, -1, 0, 0, 1, -1; 12, -6, -4, 0, -2, 2, -1, 0, 0, 1, -1, 0; 13, -6, -4, 0, -2, 2, -1, 0, 0, 1, -1, 0, -1; 14, -7, -4, 0, -2, 2, -2, 0, 0, 1, -1, 0, -1, 1; ... CROSSREFS Cf. A054524, A000012, A051731, A128407, A143350. Sequence in context: A084296 A209235 A062534 * A335123 A182715 A088425 Adjacent sequences:  A143346 A143347 A143348 * A143350 A143351 A143352 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 10 2008 STATUS approved

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

Last modified August 4 09:03 EDT 2020. Contains 336201 sequences. (Running on oeis4.)