%I #8 Jan 29 2014 13:37:33
%S 5,53,5323,53231,532313,5323139,532313921,5323139219,532313921921,
%T 53231392192123,5323139219212343,53231392192123433,
%U 5323139219212343323,53231392192123433237,5323139219212343323721,532313921921234332372189,53231392192123433237218937,5323139219212343323721893721
%N Primes arising in A069607.
%C a(n+1) is the next smallest prime beginning with a(n). Initial term is 5.
%e a(1) = 5.
%e a(2) is the next smallest prime that begins with 5, so a(2) = 53.
%e a(3) is the next smallest prime that begins with 53, so a(3) = 5323.
%e ...and so on.
%o (Python)
%o import sympy
%o from sympy import isprime
%o def b(x):
%o ..num = str(x)
%o ..n = 1
%o ..while n < 10**3:
%o ....new_num = str(x) + str(n)
%o ....if isprime(int(new_num)):
%o ......print(int(new_num))
%o ......x = new_num
%o ......n = 1
%o ....else:
%o ......n += 1
%o b(5)
%Y Cf. A069607, A110773, A048553.
%K nonn,base
%O 1,1
%A _Derek Orr_, Jan 27 2014