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 A127504 Triangle T(n,k) = phi(n) if k|n, =0 otherwise. 0
 1, 1, 1, 2, 0, 2, 2, 2, 0, 2, 4, 0, 0, 0, 4, 2, 2, 2, 0, 0, 2, 6, 0, 0, 0, 0, 0, 6, 4, 4, 0, 4, 0, 0, 0, 4, 6, 0, 6, 0, 0, 0, 0, 0, 6, 4, 4, 0, 0, 4, 0, 0, 0, 0, 4 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS FORMULA T(n,k) = A000010(n)*A051731(n,k), 1<=k<=n. EXAMPLE First few rows of the triangle are: 1; 1, 1; 2, 0, 2; 2, 2, 0, 2; 4, 0, 0, 0, 4; 2, 2, 2, 0, 0, 2; 6, 0, 0, 0, 0, 0, 6; 4, 4, 0, 4, 0, 0, 0, 4; ... CROSSREFS Cf. A051731, A062355 (row sums), A000010 (phi). Sequence in context: A292118 A277486 A102395 * A321665 A047917 A144569 Adjacent sequences:  A127501 A127502 A127503 * A127505 A127506 A127507 KEYWORD nonn,tabl,easy AUTHOR Gary W. Adamson, Jan 17 2007 STATUS approved

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Last modified January 23 07:07 EST 2020. Contains 331168 sequences. (Running on oeis4.)