1,2

This is the hexagonal analog to A260643.

Peter Kagey, Table of n, a(n) for n = 1..10000

Peter Kagey, Ruby program for computing sequence.

Illustration of a(1) through a(8) and a(13):

| | | | | | | | | 8 9 5

| | 3 | 4 3 | 4 3 | 4 3 | 4 3 | 4 3 | | 4 3 8

1 | 1 2 | 1 2 | 1 2 | 5 1 2 | 5 1 2 | 5 1 2 | 5 1 2 | ... | 5 1 2 6

| | | | | 6 | 6 7 | 6 7 4 | | 6 7 4

Cf. A047932, A260643.

Sequence in context: A115871 A138221 A038388 * A319999 A083501 A007922

Adjacent sequences: A272570 A272571 A272572 * A272574 A272575 A272576

nonn

Peter Kagey, May 03 2016

approved