- Apr 9, 2009Mark Underwood's most interesting sequence for the OEIS

might be the cases for which his conjecture fails, namely

"Numbers n such that there are no primes of the forms

2^m+3^n or 2^n+3^m for m < n"

This sequence begins with

n = 1679, 1743 ...

but Mark would need two more entries to satisfy Neil Sloane.

PFGW records that there are no more with n < 2500.

Heuristics suggest that more exist, beyond that paltry limit.

David - << Previous post in topic Next post in topic >>