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 A143542 Triangle read by rows, A051731 * A143541 as infinite lower triangular matrices; 1<=k<=n. 1
 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 2, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 2, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,17 COMMENTS Row sums = A066328: (0, 1, 2, 1, 3, 3, 4,...) Prime rows = first n terms of A010051, the characteristic function of the primes. LINKS FORMULA Triangle read by rows, A051731 * A143541 as infinite lower triangular matrices; 1<=k<=n. A051731 = the inverse Mobius transform. EXAMPLE First few rows of the triangle = 0; 0, 1; 0, 1, 1; 0, 1, 0, 0; 0, 1, 1, 0, 1; 0, 2, 1, 0, 0, 0; 0, 1, 1, 0, 1, 0, 1; ... CROSSREFS Cf. A143541, A051731, A010051. Sequence in context: A015472 A049816 A328958 * A072612 A116378 A321854 Adjacent sequences:  A143539 A143540 A143541 * A143543 A143544 A143545 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Aug 23 2008 STATUS approved

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Last modified July 27 21:21 EDT 2021. Contains 346316 sequences. (Running on oeis4.)