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Search: id:A069603
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| A069603 |
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a(1) = 2; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime. |
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+0
12
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| 2, 3, 3, 3, 3, 21, 17, 3, 13, 99, 17, 3, 7, 77, 19, 119, 7, 33, 29, 49, 149, 43, 23, 99, 9, 31, 57, 93, 29, 21, 91, 59, 31, 39, 87, 11, 121, 231, 279, 269, 51, 21, 313, 297, 527, 309, 27, 21, 67, 63, 431, 231, 13, 99, 407, 453, 69, 409, 189, 11, 31, 21, 23, 19, 93, 1143
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(6) = 21 and the number 2333321 is a prime.
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MATHEMATICA
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a[1] = 2; a[n_] := a[n] = Block[{k = 1, c = IntegerDigits @ Table[ a[i], {i, n - 1}]}, While[ !PrimeQ[ FromDigits @ Flatten @ Append[c, IntegerDigits[k]]], k += 2]; k]; Table[ a[n], {n, 67}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 05 2005)
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CROSSREFS
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Cf. A033679, A074338, A092528, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A111525.
Sequence in context: A075757 A096420 A096193 this_sequence A033679 A051670 A089702
Adjacent sequences: A069600 A069601 A069602 this_sequence A069604 A069605 A069606
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 26 2002
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EXTENSIONS
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More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jun 13 2002
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