In the infinite series 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5... each positive integer k appears k times in consecutive order.
Write a formula for the sum of the first n terms of the series.
(In reply to NAME IT
by Ady TZIDON)
I think PARI is the name of the programming language in which Sloane presents an algorithm for this series, rather than the name of this series.
Posted by Charlie
on 2007-05-15 01:30:18