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Search: id:A090900
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| A090900 |
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Least n-th power such that every concatenation is a prime. |
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+0
2
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| 2, 9, 27, 6561, 39135393, 1291467969, 3404825447, 248155780267521, 8422942255954625293713, 717897987691852588770249
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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2,29,2927,etc. are primes.
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MATHEMATICA
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c = ""; Do[k = 1; While[ !PrimeQ[ToExpression[c <> ToString[k^n]]], k++ ]; Print[k^n]; c = c <> ToString[k^n], {n, 1, 10}] (Propper)
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CROSSREFS
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Sequence in context: A128239 A019065 A115186 this_sequence A100293 A001093 A121643
Adjacent sequences: A090897 A090898 A090899 this_sequence A090901 A090902 A090903
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 11 2003
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EXTENSIONS
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More terms from Ryan Propper (rpropper(AT)stanford.edu), Jul 08 2005
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