1,1

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.

Table of n, a(n) for n=1..16.

Primes in A211002.

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

Sequence in context: A198187 A198019 A198018 * A068331 A177104 A078330

Adjacent sequences: A211000 A211001 A211002 * A211004 A211005 A211006

nonn,more

Omar E. Pol, Mar 30 2012

approved