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Topic: Relation between sum and product of primes
Replies: 14   Last Post: Jan 11, 2015 6:32 AM

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 mluttgens Posts: 80 Registered: 3/3/11
Re: Relation between sum and product of primes
Posted: Jan 9, 2015 5:26 AM

Le vendredi 9 janvier 2015 00:52:38 UTC+1, ventocil...@gmail.com a écrit :
> El jueves, 8 de enero de 2015, 8:44:46 (UTC-4:30), lut...@gmail.com escribió:
> > For instance,3+5+7=3x5
> >
> > Are there other examples of such relation?
> >
> > Th2x3x5x7 anks

>
> There are infinitely many.
> Each time that a sum of primes is composite its factorization is a prodruct of primes. Example: 3+5+7+11 = 2x13

Does that imply that the product of 2 very big primes is also a sum of consecutive primes?

Thanks

>
> This problem sugest to create a nice puzzle:
> "To find a sum of n consecutive primes that are a product of m consecutive primes."
> As example: 13+17+19+23+29+31+37+41 = 2x3x5x7 = 210

Date Subject Author
1/8/15 mluttgens
1/8/15 bert
1/8/15 mluttgens
1/8/15 mluttgens
1/8/15 ventocilla.jorge@gmail.com
1/8/15 Brian Q. Hutchings
1/8/15 ventocilla.jorge@gmail.com
1/9/15 mluttgens
1/9/15 ventocilla.jorge@gmail.com
1/10/15 mluttgens
1/10/15 bert
1/10/15 mluttgens
1/10/15 bert
1/10/15 quasi
1/11/15 mluttgens