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 A143613 Triangle read by rows, A051731 * A127368, 1<=k<=n. 1
 1, 2, 0, 2, 2, 0, 3, 0, 3, 0, 2, 2, 3, 4, 0, 4, 2, 0, 0, 5, 0, 2, 2, 3, 4, 5, 6, 0, 4, 0, 6, 0, 5, 0, 7, 0, 3, 4, 0, 4, 5, 0, 7, 8, 0, 4, 2, 6, 4, 0, 0, 7, 0, 9, 0, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 6, 2, 3, 0, 10, 0, 7, 0, 0, 0, 11, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Left border = d(n). Row sums = A057661: (1, 2, 4, 6, 11, 11, 22, 22, 31,...). LINKS FORMULA Triangle read by rows, A051731 * A127368, 1<=k<=n. A051731 = the inverse Mobius transform. A127368 records the reduced residue system mod n, by rows. EXAMPLE First few rows of the triangle = 1; 2, 0; 2, 2, 0; 3, 0, 3, 0; 2, 2, 3, 4, 0; 4, 2, 0, 0, 5, 0; 2, 2, 3, 4, 5, 6, 0; ... CROSSREFS Cf. A127368, A051731, A057661, A000005. Sequence in context: A127800 A035692 A308654 * A208955 A121363 A214258 Adjacent sequences:  A143610 A143611 A143612 * A143614 A143615 A143616 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Aug 27 2008 STATUS approved

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Last modified July 22 05:47 EDT 2019. Contains 325213 sequences. (Running on oeis4.)