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A228507 Numbers n such that first n digits of A091723 (Decimal expansion of the root x of ExpIntegralEi[x]==0) gives a prime number. 0

%I #15 Mar 29 2019 20:00:48

%S 1,2,145,180,691,4123

%N Numbers n such that first n digits of A091723 (Decimal expansion of the root x of ExpIntegralEi[x]==0) gives a prime number.

%C a(7) > 10^4.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>

%Y Cf. A091723.

%K nonn,more,less,base

%O 1,2

%A _Robert Price_, Aug 23 2013

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Last modified May 24 06:10 EDT 2024. Contains 372772 sequences. (Running on oeis4.)