

A090321


T(n,k) = prime(n+1)  prime(nk+1), 1<=k<=n, triangular array read by rows.


1



1, 2, 3, 2, 4, 5, 4, 6, 8, 9, 2, 6, 8, 10, 11, 4, 6, 10, 12, 14, 15, 2, 6, 8, 12, 14, 16, 17, 4, 6, 10, 12, 16, 18, 20, 21, 6, 10, 12, 16, 18, 22, 24, 26, 27, 2, 8, 12, 14, 18, 20, 24, 26, 28, 29, 6, 8, 14, 18, 20, 24, 26, 30, 32, 34, 35, 4, 10, 12, 18, 22, 24, 28, 30, 34, 36, 38
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OFFSET

1,2


COMMENTS

Rowreversed A086800.  R. J. Mathar, Sep 15 2012


LINKS

Table of n, a(n) for n=1..77.
Eric Weisstein's World of Mathematics, Prime Difference Function


FORMULA

T(n,1) = A001223(n); T(n,n) = A040976(n).


EXAMPLE

1;
2, 3;
2, 4, 5;
4, 6, 8, 9;
2, 6, 8, 10, 11;
4, 6, 10, 12, 14, 15;


CROSSREFS

Cf. A000040.
Sequence in context: A239690 A208460 A119465 * A241255 A174625 A178853
Adjacent sequences: A090318 A090319 A090320 * A090322 A090323 A090324


KEYWORD

nonn,tabl


AUTHOR

Reinhard Zumkeller, Jan 26 2004


STATUS

approved



