

A127504


Triangle T(n,k) = phi(n) if kn, =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
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OFFSET

1,4


LINKS

Table of n, a(n) for n=1..55.


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



