A228127 - OEIS

A228127

Numbers n such that first n digits of A091724 (Decimal expansion of E^(2*EulerGamma)) gives a prime number.

%I #26 Nov 13 2014 10:03:21

%S 1,2,3,1080

%N Numbers n such that first n digits of A091724 (Decimal expansion of E^(2*EulerGamma)) gives a prime number.

%C a(5) > 10^4.

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

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

%t nn=1100;With[{c=RealDigits[E^(2*EulerGamma),10,nn][[1]]},Select[ Range[ nn], PrimeQ[FromDigits[Take[c,#]]]&]] (* _Harvey P. Dale_, Nov 13 2014 *)

%Y Cf. A091724.

%K nonn,more,base

%O 1,2

%A _Robert Price_, Aug 26 2013