

A112790


Array where a(1,1)=1 and mth term of nth row is number of terms of (n1)th row which are coprime to the mth divisor of n.


1



1, 1, 1, 2, 2, 2, 0, 0, 3, 1, 2, 2, 1, 1, 4, 4, 2, 0, 0, 0, 4, 1, 1, 3, 2, 3, 2, 4, 4, 2, 0, 2, 0, 0, 0, 6, 2, 2, 0, 2, 0, 4, 2, 2, 2, 4, 0, 0, 0, 0, 5, 1, 2, 2, 2, 2, 2, 2, 6, 6, 2, 0, 0, 2, 0, 0, 6, 2, 2, 2, 4, 0, 4, 0, 4, 2, 2, 0, 2, 0, 0, 0, 0, 0, 8, 2, 2, 3, 0, 3, 0, 4, 0, 0, 0, 4, 0, 0, 1, 0, 0, 6, 2, 2, 0
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OFFSET

1,4


COMMENTS

Number of terms in row n is A000005(n).


LINKS

Table of n, a(n) for n=1..105.


EXAMPLE

The irregular array's 5th row is [3,1]. The divisors of 6 are 1, 2, 3 and 6. In the 5th row there are 2 terms coprime to 1, 2 terms coprime to 2, 1 term coprime to 3 and 1 term coprime to 6. So the 6th row of the array is [2,2,1,1].
Array starts
1;
1,1;
2,2;
2,0,0;
3,1;
2,2,1,1;
4,4;
2,0,0,0;


CROSSREFS

Cf. A000005, A112791.
Sequence in context: A262048 A034852 A212438 * A179835 A110857 A108867
Adjacent sequences: A112787 A112788 A112789 * A112791 A112792 A112793


KEYWORD

nonn,tabf


AUTHOR

Leroy Quet, Dec 31 2005


EXTENSIONS

More terms from R. J. Mathar, Aug 29 2007


STATUS

approved



