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A056805
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Numbers k such that 6*10^k+1 is prime.
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10
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0, 1, 2, 8, 9, 15, 20, 26, 38, 45, 65, 112, 244, 303, 393, 560, 839, 1009, 1019, 1173, 1334, 2236, 2629, 4426, 8848, 20812, 37744, 72926, 86287, 231617, 281969, 488852, 522127, 655642, 758068, 879313, 1380098
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OFFSET
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1,3
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COMMENTS
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From the Kamada data, Edward Trice reports that 231617 and 522127 are in this sequence. But these may not be the next ones. There are no others less than 2*10^5, however. - Robert Price, Jul 09 2015
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LINKS
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FORMULA
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EXAMPLE
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For k=2 => (6*10^2+1)=601, which is prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 6*10^n + 1], Print[ n ]], {n, 0, 10000}]
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PROG
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CROSSREFS
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KEYWORD
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more,nonn,changed
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AUTHOR
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EXTENSIONS
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a(26)=20812 from Kamada link by Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 27 2007
a(30)-a(36) from Kamada data by Tyler Busby, Apr 15 2024
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STATUS
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approved
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