

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
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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



