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

1,2

Comments

a(5) > 10^4.

Links

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, ConstantPrimes

Eric Weisstein's World of Mathematics, IntegerSequencePrimes

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 *)

Crossrefs

Cf. A091724.

Sequence in context: A136611 A004898 A062920 * A327660 A036111 A359323

Adjacent sequences: A228124 A228125 A228126 * A228128 A228129 A228130

Keyword

nonn,more,base

Author

Robert Price, Aug 26 2013

Status

approved