OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = A080819(n)^(1/2).
a(n) = ceiling(sqrt(n*(n+1)/2)) - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
MAPLE
seq(ceil(sqrt(n*(n+1)/2)), n=1..80); # C. Ronaldo
MATHEMATICA
lst = {}; m = 1; Do[While[n*(n + 1)/2 > m^2, m++]; AppendTo[lst, m], {n, 69}]; lst (* Arkadiusz Wesolowski, Jul 18 2012 *)
Ceiling[Sqrt[#]]&/@Accumulate[Range[80]] (* Harvey P. Dale, Feb 10 2016 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Amarnath Murthy, Mar 21 2003
EXTENSIONS
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
Name changed by Arkadiusz Wesolowski, Jul 18 2012
STATUS
approved