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A211002
Numbers congruent to 3 in the structure (or curve) of A211000.
5
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
1,1
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
KEYWORD
nonn
AUTHOR
Omar E. Pol, Mar 30 2012
STATUS
approved