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Numbers n such that first n digits of A091725 (decimal expansion of second exponential integral at 1, ExpIntegralEi[1]) gives a prime number.
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%I #19 Feb 16 2025 08:33:20

%S 26,63,323,784

%N Numbers n such that first n digits of A091725 (decimal expansion of second exponential integral at 1, ExpIntegralEi[1]) gives a prime number.

%C a(5) > 10^4.

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

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

%Y Cf. A091725.

%K nonn,more,base,changed

%O 1,1

%A _Robert Price_, Aug 23 2013