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Search: id:A033679
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| A033679 |
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a(1) = 2; 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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14
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| 2, 3, 3, 3, 3, 21, 53, 69, 81, 139, 143, 223, 233, 261, 261, 399, 553, 609, 659, 673, 1017, 1187, 1357, 1571, 1641, 1839, 2151, 2191, 2499, 2511, 2607, 2667, 2681, 3081, 3351, 4291, 4319, 4353, 4489, 4733, 4819, 6003, 6011, 6631, 6797, 7113, 7429, 7547, 7651
(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] = 2; 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. A069603, A074338, A033680, A033681, A046254, A046255, A046256, A046257, A046258, A046259, A111524.
Sequence in context: A096420 A096193 A069603 this_sequence A051670 A089702 A089336
Adjacent sequences: A033676 A033677 A033678 this_sequence A033680 A033681 A033682
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.
More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 05 2005
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