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A087389 a(1) = 3; a(n+1) is the least prime formed by adding one or more digits to the digit reversal of a(n). 3

%I #6 Dec 05 2013 19:56:21

%S 3,31,131,1319,913103,3013193,39131033,3301319309,903913103341,

%T 14330131930927,729039131033419,9143301319309279,97290391310334191,

%U 1914330131930927929,929729039131033419149,94191433013193092792927

%N a(1) = 3; a(n+1) is the least prime formed by adding one or more digits to the digit reversal of a(n).

%C Note that the digit reversal of a(6) is 3913103, which is already prime, but a(7) is required to have more digits than a(6). - _David Wasserman_, May 25 2005

%e a(2)= 31, a(3) is the smallest prime beginning with 31 and is 131.

%Y Cf. A087388, A087390, A087391.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Sep 09 2003

%E More terms from _David Wasserman_, May 25 2005

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Last modified April 23 12:08 EDT 2024. Contains 371912 sequences. (Running on oeis4.)