Numbers k such that 2*k+1 and 5*k+1 are both pentagonal numbers (A000326).
A279275
Numbers k such that 2*k+1 and 5*k+1 are both pentagonal numbers (A000326).
Terms
- a(0) =500a(1) =721525a(2) =1040439075
External references
- oeis: A279275
A279275
Numbers k such that 2*k+1 and 5*k+1 are both pentagonal numbers (A000326).