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Search: id:A064432
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| A064432 |
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Least k such that k*10^n-9, k*10^n-7, k*10^n-3 and k*10^n-1 are all prime. |
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2
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| 14, 2, 2, 248, 1856, 7190, 719, 15308, 13415, 18434, 13532, 26975, 6935, 61763, 17786, 60140, 6014, 297974, 103199, 56321, 80009, 428186, 303476, 32558, 1361063, 444275, 634451, 116573, 303593, 293822, 1068491, 651464, 1855937, 3217754, 364985, 569129
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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a(1) = 2 because 19, 17, 13 and 11 are all prime.
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MATHEMATICA
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Do[k = 1; While[ !PrimeQ[k*10^n - 1] || !PrimeQ[k*10^n - 3] || !PrimeQ[k*10^n - 7] || !PrimeQ[k*10^n - 9], k++ ]; Print[k], {n, 0, 35} ] (From Robert G. Wilson v)
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CROSSREFS
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Cf. A064281.
Sequence in context: A040191 A040193 A064972 this_sequence A040194 A107834 A070701
Adjacent sequences: A064429 A064430 A064431 this_sequence A064433 A064434 A064435
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KEYWORD
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nonn
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AUTHOR
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Don Reble (djr(AT)nk.ca), Oct 17 2001
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