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Search: id:A069610
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| A069610 |
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a(1) = 8; a(n) = smallest number such that the juxtaposition a(1)a(2)...a(n) is a prime. |
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21
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| 8, 3, 9, 11, 7, 21, 23, 3, 7, 29, 3, 99, 9, 93, 1, 39, 33, 21, 137, 123, 57, 13, 191, 3, 163, 9, 143, 63, 21, 157, 521, 163, 161, 43, 161, 109, 107, 121, 423, 57, 71, 7, 173, 469, 107, 57, 177, 411, 49, 149, 61, 291, 413, 271, 299, 693, 349, 149, 73, 299, 271, 521
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OFFSET
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1,1
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EXAMPLE
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a(4) = 11 and the number 83911 is a prime.
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MATHEMATICA
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a[1] = 8; 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. A046258, A074344, A092528, A069603, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A111525.
Sequence in context: A135005 A090734 A011467 this_sequence A069200 A069218 A070608
Adjacent sequences: A069607 A069608 A069609 this_sequence A069611 A069612 A069613
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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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