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A056804
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Numbers k such that 7*10^k + 1 is prime.
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7
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1, 2, 3, 4, 5, 8, 9, 45, 136, 142, 158, 243, 923, 1235, 2196, 4650, 6119, 7324, 9543, 13494, 20310, 20360, 232920, 830865, 902708, 1454508
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OFFSET
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1,2
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COMMENTS
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7*10^902708+1 was the 84th-largest known prime in the world as of Jun 28 2013. Also largest known "base-10" form for a prime number. There are no other values of k in this sequence between 232920 and 902708 that yield a prime. - Edward A. Trice, Jul 03 2013
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LINKS
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FORMULA
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MATHEMATICA
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Do[ If[ PrimeQ[ 7*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
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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