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Search: id:A069611
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| A069611 |
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a(1) = 9; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime. |
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+0
21
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| 9, 7, 1, 9, 17, 13, 33, 23, 7, 77, 31, 59, 51, 27, 7, 269, 439, 11, 429, 163, 39, 11, 463, 77, 63, 39, 33, 93, 21, 139, 53, 159, 49, 9, 291, 111, 21, 23, 349, 83, 3, 37, 11, 57, 21, 219, 507, 1233, 429, 147, 627, 127, 399, 27, 63, 423, 111, 633, 1391, 297, 831, 283
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OFFSET
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1,1
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EXAMPLE
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a(5) = 17 and the number 971917 is a prime.
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MATHEMATICA
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a[1] = 9; 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, A046259, A074345, A092528, A069603, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A111525.
Sequence in context: A106727 A094134 A154396 this_sequence A083995 A021511 A029688
Adjacent sequences: A069608 A069609 A069610 this_sequence A069612 A069613 A069614
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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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