A228127 Numbers n such that first n digits of A091724 (Decimal expansion of E^(2*EulerGamma)) gives a prime number.

1, 2, 3, 1080

Offset: 1

Author

Robert Price, Aug 26 2013

Keywords

• nonn
• more
• base

Comments

a(5) > 10^4.

Links

• Eric Weisstein's World of Mathematics, ConstantPrimes
• Eric Weisstein's World of Mathematics, IntegerSequencePrimes

Crossrefs

Cf. A091724.

Programs

Mathematica

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