FA Limiteds — Rest in peace

Started Apr 7, 2014 | Discussions thread
audiobomber Veteran Member • Posts: 5,721
Re: Prime numbers

Roland Karlsson wrote:

31 and 43 are prime numbers, the 77 is not. It is 7x11 though, the product of two prime numbers.

Suitable for prime lenses.

A little far fetched maybe

I heard the 77 came about because 7 is a lucky number.

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