OFFSET
1,1
EXAMPLE
a(7) = 75 as the 75th triangular number 2850 > 28 is the smallest triangular number beginning with 28 which is the seventh triangular number.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jul 31 2002
EXTENSIONS
Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 25 2003
STATUS
approved