A019778 Decimal expansion of sqrt(e)/5.

3, 2, 9, 7, 4, 4, 2, 5, 4, 1, 4, 0, 0, 2, 5, 6, 2, 9, 3, 6, 9, 7, 3, 0, 1, 5, 7, 5, 6, 2, 8, 3, 2, 7, 1, 4, 3, 3, 0, 7, 5, 5, 2, 2, 0, 1, 4, 2, 0, 2, 9, 6, 0, 2, 3, 1, 5, 0, 1, 5, 8, 6, 2, 3, 2, 8, 1, 3, 2, 2, 0, 4, 2, 3, 8, 8, 4, 3, 1, 2, 1, 7, 2, 6, 5, 5, 5, 3, 0, 4, 0, 1, 1, 2, 7, 3, 3, 2, 8

Offset

0,1

Links

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Index entries for transcendental numbers

Formula

Equals 0.1 * 2*sqrt(e) = 0.1 * Sum_{k>=0} (2*k+1)/(2^k * k!). - Amiram Eldar, Aug 07 2020

Example

0.32974425414002562936973015756283271433075522014202...

Mathematica

RealDigits[Sqrt[E]/5, 10, 120][[1]] (* Harvey P. Dale, Aug 25 2019 *)

Prog

(Magma)
m:= 510; R:=RealField(m); SetDefaultRealField(R);
Prune(Reverse(IntegerToSequence(Floor(( Exp(1/2)/5 )*10^(Floor(m/2)) )))); // G. C. Greubel, Nov 06 2025
(SageMath)
numerical_approx( exp(1/2)/5 , digits=265 ) # G. C. Greubel, Nov 06 2025

Crossrefs

Cf. A019774.

Sequence in context: A078478 A346109 A362220 * A134480 A182950 A011323

Adjacent sequences: A019775 A019776 A019777 * A019779 A019780 A019781

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved