Search: id:A046257
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%I A046257
%S A046257 7,9,19,27,47,57,61,81,179,211,251,273,373,477,581,753,847,909,909,939,
%T A046257 957,1173,1311,1343,1543,1619,1693,1739,1879,1971,2141,2523,2653,2729,
%U A046257 2863,3201,3293,3411,3621,3753,5023,5421,5459,5481,6403,6827,7041,7669
%N A046257 a(1) = 7; a(n) is smallest number >= a(n-1) such that the juxtaposition 
               a(1)a(2)...a(n) is a prime.
%t A046257 a[1] = 7; a[n_] := a[n] = Block[{k = a[n - 1], c = IntegerDigits @ Table[ 
               a[i], {i, n - 1}]}, While[ !PrimeQ[ FromDigits @ Flatten @ Append[c, 
               IntegerDigits[k]]], k += 2]; k]; Table[ a[n], {n, 46}] (from Robert 
               G. Wilson v (rgwv(at)rgwv.com), Aug 05 2005)
%Y A046257 Cf. A069609, A074343, A033680, A033679, A033681, A046254, A046255, A046256, 
               A046258, A046259, A111524.
%Y A046257 Sequence in context: A138749 A053803 A032791 this_sequence A074343 A103853 
               A139202
%Y A046257 Adjacent sequences: A046254 A046255 A046256 this_sequence A046258 A046259 
               A046260
%K A046257 nonn
%O A046257 1,1
%A A046257 Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.

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