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A213072 Smallest number whose decimal expansion is a concatenation of two primes in n different ways. 1

%I #29 Jun 23 2012 14:36:44

%S 22,237,2337,29397,739397,23932917,1997771997,79279391397

%N Smallest number whose decimal expansion is a concatenation of two primes in n different ways.

%C a(9) <= 4999363379397. - _Donovan Johnson_, Jun 17 2012

%e a(3) = 2337 because 2337 is the smallest number that can be separated into two primes in three different ways: 2 and 337, 23 and 37, 233 and 7.

%K nonn,base

%O 1,1

%A _Claudio Meller_, Jun 04 2012

%E a(5)-a(6) from _David W. Wilson_, Jun 04 2012

%E a(7)-a(8) from _Donovan Johnson_, Jun 16 2012

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Last modified July 23 11:07 EDT 2024. Contains 374549 sequences. (Running on oeis4.)