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A109713
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Numbers n such that 99 * 10^n + 1 is prime.
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1
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1, 2, 4, 8, 16, 20, 24, 72, 200, 359, 454, 624, 1054, 2060, 6301, 8083, 8407, 13159, 65059, 74957
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OFFSET
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1,2
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COMMENTS
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All terms have been certified. No more up to 21000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 99*10^13159+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 17 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 99*10^13159+1 is prime! (29.5646s+0.0028s)
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LINKS
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EXAMPLE
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For n=8 we have 99*10^8+1 = 9900000001, which is prime.
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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(19)-a(20) from Kamada data by Tyler Busby, Apr 16 2024
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STATUS
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approved
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