A182585 Markov numbers that are semiprime.

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

Offset: 1

Author

Jonathan Vos Post, May 06 2012

Keywords

• nonn
• easy

Comments

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

Examples

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

Crossrefs

Cf. A001358, A002559, A178444.

Formula

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