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Search: id:A064118
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| A064118 |
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Numbers n such that the first n digits of e form a prime. |
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+0
5
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OFFSET
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1,2
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REFERENCES
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C. A. Pickover, The Mathematics of Oz, "2, 271, 2718281", Chapter 95, Camb.Univ.Press, UK 2002.
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LINKS
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Eric Weisstein's World of Mathematics, e-Prime
Eric Weisstein's World of Mathematics, e-Prime
Eric Weisstein's World of Mathematics, Integer Sequence Primes
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EXAMPLE
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a(2)=3 because 271 is prime
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MATHEMATICA
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Do[ If[ PrimeQ[ FromDigits[ RealDigits[ N[ E, n + 10 ], 10, n ][ [ 1 ] ] ] ], Print[ n ] ], {n, 1, 2300} ]
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CROSSREFS
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Cf. A001113.
Cf. A047658.
Sequence in context: A077793 A045974 A001531 this_sequence A082715 A041705 A137130
Adjacent sequences: A064115 A064116 A064117 this_sequence A064119 A064120 A064121
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KEYWORD
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base,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Sep 09 2001
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EXTENSIONS
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One more term from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 28 2001
a(6) from Eric Weisstein (eric(AT)weisstein.com), Jan 17 2005
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