A110350 Least sum (n+1) + (n+2) + ...+(n+k) >= (n(n+1)/2), the n-th triangular number.

2, 3, 9, 11, 21, 24, 38, 42, 46, 65, 70, 93, 99, 105, 133, 140, 172, 180, 216, 225, 234, 275, 285, 330, 341, 352, 402, 414, 468, 481, 539, 553, 567, 630, 645, 712, 728, 744, 816, 833, 909, 927, 1007, 1026, 1045, 1130, 1150, 1239, 1260, 1281, 1375, 1397, 1495

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Example

a(4) = 5+6 = 11 > 10.
a(7) = 8+9+10+11 = 38 > 28, while 8+9+10 = 27 < 28.

Crossrefs

Sequence in context: A257027 A271548 A369338 * A057569 A177950 A049618

Adjacent sequences: A110347 A110348 A110349 * A110351 A110352 A110353

Keyword

easy,nonn

Author

Amarnath Murthy, Jul 21 2005

Extensions

Corrected and extended by Emeric Deutsch, Aug 01 2005

Status

approved