OFFSET
1,2
COMMENTS
Every positive number appears exactly once. Proof: N will appear as the first term of row N, unless it has already appeared. And no term is repeated, by definition.
The first term of the 20th row is 200 unlike the 20th row of A077339 where it is 20.
LINKS
M. F. Hasler, Table of n, a(n) for n = 1..5350
EXAMPLE
Triangle begins:
1
2 20
3 30 31
4 40 41 42
5 50 51 52 53
...
PROG
(PARI) {u=[]; for(m=1, 19, o=0; for(n=1, m, while(setsearch(u, a=A077339(m, n+o)), o++); u=setunion(u, Set(a)); print1(a", ")))} \\ M. F. Hasler, Jan 08 2013
CROSSREFS
KEYWORD
AUTHOR
Amarnath Murthy, Nov 05 2002
EXTENSIONS
Edited by N. J. A. Sloane, Jun 12 2007
STATUS
approved