A031016 - OEIS

A031016

Write n in base 7, then complement each digit (d -> 6-d) and juxtapose.

5, 4, 3, 2, 1, 0, 5, 6, 5, 5, 5, 4, 5, 3, 5, 2, 5, 1, 5, 0, 4, 6, 4, 5, 4, 4, 4, 3, 4, 2, 4, 1, 4, 0, 3, 6, 3, 5, 3, 4, 3, 3, 3, 2, 3, 1, 3, 0, 2, 6, 2, 5, 2, 4, 2, 3, 2, 2, 2, 1, 2, 0, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1, 0, 0, 6, 0, 5, 0, 4, 0, 3, 0, 2, 0, 1, 0, 0

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OFFSET

1,1

LINKS

Chris R. Rehmann, Table of n, a(n) for n = 1..10000

MATHEMATICA

6-Flatten[ IntegerDigits[ Range@50, 7]] (* Robert G. Wilson v, Jul 01 2014 *)

PROG

(Python)

from sympy.ntheory import digits

from itertools import count, islice

def agen(): # generator of terms