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A090508 Least number beginning with prime(n) such that every concatenation is a prime. 1

%I

%S 2,3,51,71,1137,1321,1727,1947,2383,2919,311,3723,4173,43197,47307,

%T 531,59103,6117,67279,7191,73457,79159,8379,8913,97697,1011483,10399,

%U 107151,10959,113529,12713,1311171,137649,139101,149107,1511229,15743,163639

%N Least number beginning with prime(n) such that every concatenation is a prime.

%p l:=[]: for n from 1 to 40 do p:=ithprime(n): m:=p: lcon:=cat(op(l)): for i from 1 do if(isprime(parse(cat(lcon,m)))) then l:=[op(l),m]: break fi: m:=parse(cat(p,2*i-1)) od od: op(l); # C. Ronaldo

%Y Cf. A090509.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Dec 06 2003

%E More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 18 2005

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)