OFFSET
1,2
COMMENTS
a(n) = triangular number corresponding to A000461(n).
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..166
EXAMPLE
a(4) = 9876790 = 4444*4445/2.
MATHEMATICA
(#(#+1))/2&/@Table[FromDigits[Flatten[IntegerDigits/@PadRight[{}, n, n]]], {n, 15}] (* Harvey P. Dale, Oct 15 2021 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Nov 18 2002
EXTENSIONS
More terms from Sascha Kurz, Jan 07 2003
STATUS
approved