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Re:The Bitcoin Lottery by Tichy on Tuesday May 17, 2011 @01:58PM (#2557181)
Related: here is how to calculate the expected number of days. Though I did not add in BitCoin specific parameters. But suppose you need to have zeros in the first k bits, I suppose the probability for each lottery ticket/number is (256-k)/256 (I assume that SHA256 has 256 bits, too lazy to look it up).

http://blog.blinker.net/2011/02/08/expected-number-of-coin-t...

At the moment I generate about 5BTC/day with my dual-core ATI graphics card. Two months ago (when I started), it was twice that.

Re:The Bitcoin Lottery by dmn001 on Tuesday May 17, 2011 @02:44PM (#2557370)
You could also use the bitcoin calculator: http://www.alloscomp.com/bitcoin/calculator.php
Re:The Bitcoin Lottery by Tichy on Tuesday May 17, 2011 @03:13PM (#2557468)
Of course, my blog post just explains how to implement something like the bitcoin calculator.