Squared radii of circles around a point of the hexagonal lattice that contain a record number of lattice points.

A230655

Squared radii of circles around a point of the hexagonal lattice that contain a record number of lattice points.

Terms

    a(0) =0a(1) =1a(2) =7a(3) =49a(4) =91a(5) =637a(6) =1729a(7) =8281a(8) =12103a(9) =53599a(10) =157339a(11) =375193a(12) =1983163a(13) =4877509a(14) =13882141a(15) =85276009a(16) =180467833a(17) =596932063a(18) =3428888827a(19) =4178524441a(20) =7760116819a(21) =29249671087a(22) =36412855843a(23) =147442219561a(24) =254889990901a(25) =473367125959

External references