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A093354 Number of prime triples (p,q,r) with p < q < r <= n and q - p = r - q. 1
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 9, 9, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 13, 13, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 20, 20, 20, 20, 20, 20, 23, 23, 24, 24, 24, 24, 24, 24, 26, 26, 26, 26, 30, 30, 32, 32, 32, 32, 32, 32, 36 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..79.

EXAMPLE

a(20)=5:

(3,5,7), 5 - 3 = 7 - 5;

(3,7,11), 7 - 3 = 11 - 7;

(5,11,17), 11 - 5 = 17 - 11;

(3,11,19), 11 - 3 = 19 - 11;

(7,13,19), 13 - 7 = 19 - 13.

CROSSREFS

Sequence in context: A122521 A086394 A029226 * A317245 A332277 A109701

Adjacent sequences:  A093351 A093352 A093353 * A093355 A093356 A093357

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Apr 27 2004

STATUS

approved

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Last modified February 26 17:22 EST 2021. Contains 341632 sequences. (Running on oeis4.)