0,1

If m=n then only one example m=n=1 exists.

Factorization :

2^12*5^2*7*13*3^2*11^2

2^13*5^2*7*13*8191*3^2*11^2

2^14*5*7^2*13*43*127*3^2*11^2

2^15*5^4*7*13*31*151*3^2*11^2

Cf. A144651.

Sequence in context: A050288 A159569 A159292 this_sequence A135047 A017541 A112453

Adjacent sequences: A144645 A144646 A144647 this_sequence A144649 A144650 A144651

nonn

Yasutoshi Kohmoto zbi74583.boat at orange.zero.jp, Jan 19 2009