OFFSET
0,2
COMMENTS
Note that this is not "Least triangular number whose digits ARE a permutation of {0,1,...,n}" because there is no such value for n = 3, for instance 3321 = T(81) has no zero. Are there equivalents in all integer bases?
EXAMPLE
a(0) = 0 = T(0).
a(1) = 10 = T(4).
a(2) = 120 = T(15).
a(3) = 12403 = T(157).
a(4) = 12403 = T(157).
a(5) = 231540 = T(680).
a(6) = 1053426 = T(1451).
a(7) = 10623745 = T(4609).
a(8) = 120784653 = T(15542).
a(9) = 1062489753 = T(46097).
CROSSREFS
KEYWORD
base,easy,fini,full,nonn
AUTHOR
Jonathan Vos Post, Nov 15 2005
EXTENSIONS
Extended by Ray Chandler, Nov 19 2005
STATUS
approved