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 September 21st, 2015, 12:44 PM #1 Banned Camp   Joined: Dec 2013 Posts: 1,117 Thanks: 41 Particular primes : summed primes Hi, Im still obsessed by prime number. 121123 is prime number 12+11=23 How many primes are of such form? 167 is a prime of that form 1+6=7 I did not check on OEIS so if such sequence exists yet then Im sorry.
 September 21st, 2015, 12:53 PM #2 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Depending on how you interpret this it's https://oeis.org/A067860 or https://oeis.org/A088291 or some subsequence of one of these. Thanks from mobel
 September 21st, 2015, 01:44 PM #3 Banned Camp   Joined: Dec 2013 Posts: 1,117 Thanks: 41 Thank you for the references. I was working on something else (puzzle) then the idea came. I posted it. So you can lock this thread.

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