Numbers k such that 3*k^2 - 3*k + 1 is both a square (A000290) and a centered hexagonal number (A003215).
A001922
Numbers k such that 3*k^2 - 3*k + 1 is both a square (A000290) and a centered hexagonal number (A003215).
Terms
- a(0) =1a(1) =8a(2) =105a(3) =1456a(4) =20273a(5) =282360a(6) =3932761a(7) =54776288a(8) =762935265a(9) =10626317416a(10) =148005508553
External references
- oeis: A001922