Challenge: First Digit of Factorial Programme

12052017, 08:11 AM
(This post was last modified: 12052017 09:46 AM by Gerald H.)
Post: #1




Challenge: First Digit of Factorial Programme
The challenge is to produce a programme that for natural number input N returns the first, ie leftmost, digit of N! on the 50g.
The programme below uses the formula here http://mathworld.wolfram.com/StirlingsAp...ation.html & gives correct answers for input 0 to 5,362. The OEIS reference is here Edit: Was wrong link. https://oeis.org/A008905 Speed is the secondary consideration & accuracy the first. I don't expect my programme to be bettered but would be very pleased to be proven wrong. Size: 76. CkSum: # 86A4h Code: :: 

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