1,1

From the first 19 strong pseudoprimes to bases 2 and 3 (A072276) only 6 are overpseudoprimes to the same bases.

Cf. A141232 A141350 A001262 A020229 A072276.

Sequence in context: A034607 A015363 A157844 this_sequence A125780 A116105 A116128

Adjacent sequences: A140655 A140656 A140657 this_sequence A140659 A140660 A140661

nonn

Vladimir Shevelev (shevelev(AT)bgu.ac.il), Jul 10 2008