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Search: id:A046254
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| A046254 |
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a(1) = 4; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime. |
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13
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| 4, 7, 9, 9, 39, 47, 57, 81, 111, 123, 243, 283, 287, 313, 407, 507, 807, 1057, 1209, 1211, 1443, 1447, 1619, 2019, 2269, 2429, 2637, 2679, 2751, 3007, 3287, 3789, 3829, 3833, 3949, 4151, 4533, 4821, 5097, 5331, 5457, 5529, 5691, 6021, 6153, 6393, 6409
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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a[1] = 4; 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 ++ ]; k]; Table[ a[n], {n, 47}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 05 2005)
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CROSSREFS
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Cf. A069606, A074340, A033680, A033679, A033681, A046255, A046256, A046257, A046258, A046259, A111524.
Sequence in context: A105169 A085108 A106502 this_sequence A123573 A085746 A081828
Adjacent sequences: A046251 A046252 A046253 this_sequence A046255 A046256 A046257
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KEYWORD
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nonn
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.
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