OFFSET
0,1
COMMENTS
Repeats after 30 terms. - Chai Wah Wu, Feb 08 2016
REFERENCES
GCHQ Director's Christmas Puzzles for 2015.
EXAMPLE
The table begins
3 2 1
4 4 4
6 7 5
6 8 0
3 7 0
2 6 8
9 4 9
2 0 6
8 5 1
2 0 8
...
and one can see the three arithmetic progressions down the diagonals: 3, 4, 5, 6, ...; 2, 4, 6, 8, ...; 1, 4, 7, 0, ... .
PROG
(Python)
from __future__ import division
A268517_list = [321]
for i in range(10**4):
a = A268517_list[-1]
A268517_list.append(((a+1+(2-i)%3) % 10)*100 + ((a//100+1+(-i)%3) % 10)*10 + ((a//10+1+(1-i)%3) % 10)) # Chai Wah Wu, Feb 08 2016
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Feb 08 2016
EXTENSIONS
More terms from Chai Wah Wu, Feb 08 2016
STATUS
approved