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A056806
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Numbers n such that 4*10^n + 1 is prime.
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10
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0, 1, 2, 3, 13, 229, 242, 309, 957, 1473, 1494, 3182, 3727, 4177, 23210, 25719, 32835, 36990, 103958
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OFFSET
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1,3
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COMMENTS
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Some of the results were computed using the PrimeFormGW (PFGW) primality-testing program. - Hugo Pfoertner, Nov 14 2019
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LINKS
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FORMULA
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MATHEMATICA
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Do[ If[ PrimeQ[ 4*10^n + 1], Print[ n ]], {n, 0, 30000}]
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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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36990 from Peter Benson, Aug 23 2003 confirmed as next term by Ray Chandler, Sep 07 2010
103958 from Peter Benson, Dec 31 2004 confirmed as next term by Ray Chandler, Feb 18 2012
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STATUS
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approved
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