7,1

a(n) = 6*(n^2 + n + 1) = a(n-1) + 12*n

In octal notation "666" means 6*8*8 + 6*8 + 6 = 438.

Sequence in context: A015371 A045106 A137201 this_sequence A038852 A043419 A023909

Adjacent sequences: A121202 A121203 A121204 this_sequence A121206 A121207 A121208

easy,nonn

Axel Harvey (ax(AT)hirsig.ca), Aug 19 2006