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Search: id:A069606
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| A069606 |
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a(1) = 4; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime. |
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22
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| 4, 1, 9, 11, 19, 3, 3, 41, 51, 51, 87, 19, 63, 23, 13, 29, 3, 219, 183, 27, 27, 3, 3, 27, 217, 129, 381, 59, 163, 281, 169, 57, 77, 31, 9, 9, 243, 147, 21, 239, 39, 219, 693, 37, 143, 789, 9, 163, 219, 497, 51, 301, 149, 103, 117, 309, 591, 159, 741, 131, 541, 1377, 207
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(5) = 19 and the number 4191119 is a prime.
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MATHEMATICA
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a[1] = 4; 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, 63}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 05 2005)
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CROSSREFS
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Cf. A069602, A069604, A046254, A074340, A092528, A069603, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A111525.
Adjacent sequences: A069603 A069604 A069605 this_sequence A069607 A069608 A069609
Sequence in context: A067015 A158199 A091885 this_sequence A001254 A075150 A143763
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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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