OFFSET
2,1
COMMENTS
Successive trigrams have different digits, starting with the lowest available one -- as one can see here: 2 1 3 1 2 3 1 2 3 1 3 2 1 2 3 1 2 3 1 3 2 1 2 3 1 2 3 1 2 3 1 2 3 gives: [213] [123] [123] [132] [123] [123] [132] [123] [123] [123] [123]...
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Eric Angelini, May 02 2005
STATUS
approved