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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

Table of n, a(n) for n=1..66.

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.)