Post
Topic
Board Bitcoin Discussion
Re: ARG Puzzle with 3.5 BTC Private Key Prize *more
by
Yemmster
on 02/07/2014, 17:11:32 UTC
According to Wolfram Alpha, it's not a triangular number.  Sad

http://www.wolframalpha.com/input/?i=is+2147129+a+triangular+number%3F

"if the positive triangular root n of x is an integer, then x is the nth triangular number"

$ bc
((8 * 2147129 + 1) -1 )/2
8588516.00000000000000000000

I have to challenge your result here Prospero, sorry about that. Dug out my old mathbooks from the university to verify, it might still be wrong though so if someone else could verify it Please do.

http://i.imgur.com/d90yvj2.png