A090321 - OEIS

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A090321

T(n,k) = prime(n+1) - prime(n-k+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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row-reversed 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

Sequence in context: A343934 A119465 A359369 * A241255 A174625 A178853

Adjacent sequences: A090318 A090319 A090320 * A090322 A090323 A090324

KEYWORD

nonn,tabl

AUTHOR

Reinhard Zumkeller, Jan 26 2004

STATUS

approved