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Search: id:A046255
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| A046255 |
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a(1) = 5; 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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11
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| 5, 9, 9, 21, 53, 67, 71, 87, 87, 91, 117, 161, 187, 213, 363, 419, 501, 537, 543, 739, 879, 1101, 1329, 1391, 1641, 1939, 2093, 2109, 2331, 2557, 2639, 2697, 2863, 3441, 3441, 4413, 4461, 4479, 4557, 5489, 6033, 6267, 6351, 6973, 7181, 7459, 7679, 8113
(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] = 5; 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, 49}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 05 2005)
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CROSSREFS
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Cf. A069607, A074341, A033680, A033679, A033681, A046254, A046256, A046257, A046258, A046259, A111524.
Sequence in context: A127500 A057655 A141124 this_sequence A068388 A093711 A101082
Adjacent sequences: A046252 A046253 A046254 this_sequence A046256 A046257 A046258
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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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