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Search: id:A101398
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| A101398 |
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Numbers n such that 4*10^n-3 is prime. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Some of the larger entries may only correspond to probable primes.
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LINKS
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Makoto Kamada, Factorizations of 399...997.
Index entries for primes involving repunits.
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EXAMPLE
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n = 1, 2, 14, 20 are members since 37, 397, 399999999999997 and 399999999999999999997
are prime numbers.
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MATHEMATICA
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Do[ If[ PrimeQ[4*10^n - 3], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Cf. A089675.
Sequence in context: A108029 A032476 A059205 this_sequence A131221 A138047 A005237
Adjacent sequences: A101395 A101396 A101397 this_sequence A101399 A101400 A101401
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KEYWORD
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hard,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Jan 15 2005
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