

A182585


Markov numbers that are semiprime.


0



34, 169, 194, 985, 4181, 9077, 14701, 51641, 135137, 294685, 499393, 646018, 925765, 1136689, 1346269, 2012674, 6625109, 8399329, 9647009, 11485154, 16964653, 21531778, 43484701, 48928105, 111242465, 137295677, 144059117, 165580141, 225058681, 253191266
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OFFSET

1,1


COMMENTS

This is to A178444 as semiprimes A001358 are to primes A000040.


LINKS

Table of n, a(n) for n=1..30.


FORMULA

A001358 Intersection A002559. {x, y, or z satisfying x^2 + y^2 + z^2 = 3xyz, also such that A001222(of that number) = 2}.


EXAMPLE

194 is in this sequence because it is a Markoff (or Markov) number, and 194 = 2 * 97.


CROSSREFS

Cf. A001358, A002559, A178444.
Sequence in context: A212407 A190607 A256395 * A191593 A259944 A063652
Adjacent sequences: A182582 A182583 A182584 * A182586 A182587 A182588


KEYWORD

nonn,easy


AUTHOR

Jonathan Vos Post, May 06 2012


STATUS

approved



