login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227514 Decimal expansion of the square root of 2/e. 0
8, 5, 7, 7, 6, 3, 8, 8, 4, 9, 6, 0, 7, 0, 6, 7, 9, 6, 4, 8, 0, 1, 8, 9, 6, 4, 1, 2, 7, 8, 7, 7, 2, 4, 7, 8, 1, 2, 0, 7, 9, 8, 6, 0, 7, 7, 5, 2, 5, 7, 0, 2, 9, 3, 9, 9, 9, 7, 4, 1, 9, 4, 8, 1, 1, 7, 9, 4, 9, 9, 8, 4, 0, 1, 8, 3, 0, 0, 2, 1, 6, 0 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

This appears for example while integrating the product of the absolute value of H_2(x) exp(-x^2) over the real line, where H_2 is the second Hermite polynomial.

LINKS

Table of n, a(n) for n=0..81.

R. J. Mathar, Orthogonal linear combinations of Gaussian Type Orbitals, arXiv:physics/9907051, Section VII.

FORMULA

Square root of A135002 and also the ratio A002193 / A019774 .

EXAMPLE

0.85776388496070679648018...

MAPLE

evalf(sqrt(2/exp(1))) ;

PROG

(PARI) sqrt(2/exp(1)) \\ Charles R Greathouse IV, Apr 16 2014

CROSSREFS

Sequence in context: A085663 A265303 A021925 * A305036 A119812 A153799

Adjacent sequences:  A227511 A227512 A227513 * A227515 A227516 A227517

KEYWORD

cons,nonn,easy

AUTHOR

R. J. Mathar, Jul 14 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 5 20:45 EST 2019. Contains 329779 sequences. (Running on oeis4.)