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a(1) = 5; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n-1). Alternate left and right concatenation yielding primes.
4

%I #2 Dec 05 2013 19:55:16

%S 5,53,353,3533,33533,3353321,113353321,1133533213,101133533213,

%T 10113353321311,310113353321311,3101133533213117,143101133533213117,

%U 14310113353321311739,314310113353321311739,314310113353321311739103

%N a(1) = 5; a(2n) = smallest prime that is a right concatenation of a(2n-1) and a number with no insignificant zeros and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n-1). Alternate left and right concatenation yielding primes.

%e a(4) = 3533 staring with a(3) =353 and a(5) = 33533 ending in a(4) = 3533.

%Y Cf. A053582, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A069613, A069614, A069615, A069616.

%K nonn,base

%O 1,1

%A _Amarnath Murthy_, Mar 27 2002

%E More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003