A211002 Numbers congruent to 3 in the structure (or curve) of A211000.

3, 15, 31, 35, 43, 47, 51, 151, 155, 175, 179, 243, 247, 251, 255, 339, 343, 347, 355, 359, 363, 367, 371, 391, 395, 403, 407, 6571, 6575, 6583, 6587, 6591, 6595, 6599, 6603, 6607, 6611, 6615, 6619, 6623, 6627, 6631, 6635, 6655, 6659, 6675, 6679, 6683, 6687

Offset: 1

Author

Omar E. Pol, Mar 30 2012

Keywords

• nonn

Comments

The behavior seems to be as modular arithmetic but in a growing structure. For n >= 13 the structure is essentially a column of tangent circles of radius 1.

Crossrefs

Cf. A211000, A211001, A211003, A211010, A211011, A211020-211023.