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Find number property and write RPL program (HP-49G,G+, HP 50g)
10-12-2014, 12:50 PM (This post was last modified: 10-12-2014 12:52 PM by Gerson W. Barbosa.)
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Gerson W. Barbosa Offline
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RE: Find number property and write RPL program (HP-49G,G+, HP 50g)
(10-12-2014 10:20 AM)Thomas Ritschel Wrote:  Encouraged by Gerson's findings I was checking the serial numbers of quite a few bank notes and luckily also found two Sophie Germain primes (see attached image).

Surprisingly one of these numbers (the one on the 100 Euro note) is also a member of another special prime form.

Can you find it?

Nice find! Twin primes are more rare than Sophie Germain primes. The one you've found belongs to both sets!

Twin primes are related to Brun's constant, to which I've found a remarkable approximation:

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=236473
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RE: Find number property and write RPL program (HP-49G,G+, HP 50g) - Gerson W. Barbosa - 10-12-2014 12:50 PM



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