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!)
A246041 Decimal expansion of a constant related to A173938. 1
6, 9, 4, 8, 1, 9, 3, 0, 0, 8, 6, 6, 7, 3, 0, 5, 3, 6, 2, 6, 7, 1, 9, 2, 7, 5, 0, 6, 2, 0, 3, 5, 2, 5, 1, 2, 7, 7, 0, 2, 1, 1, 6, 9, 6, 8, 6, 7, 2, 4, 4, 1, 5, 2, 8, 8, 9, 4, 4, 2, 3, 3, 8, 9, 0, 2, 6, 6, 9, 5, 9, 2, 3, 9, 8, 3, 0, 6, 5, 4, 5, 6, 1, 0, 6, 6, 5, 9, 6, 4, 6, 1, 4, 3, 9, 8, 0, 3, 3, 9, 9, 6, 6, 2, 4, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..105.

FORMULA

Equals lim n -> infinity (A173938(n)/n!)^(1/n).

Root of the equation sqrt(2*Pi)*(erfi(1/sqrt(2)) + erfi((1/x-1)/sqrt(2))) = 2*exp(1/2).

EXAMPLE

0.694819300866730536267192750620352512770211696867244152889...

MAPLE

evalf(solve(sqrt(2*Pi)*(erfi(1/sqrt(2)) + erfi((1/x-1)/sqrt(2))) = 2*exp(1/2), x), 100)

MATHEMATICA

RealDigits[x /.FindRoot[2*Sqrt[E] - Sqrt[2*Pi]*Erfi[1/Sqrt[2]] - Sqrt[2*Pi] * Erfi[(-1 + 1/x)/Sqrt[2]], {x, 1/2}, WorkingPrecision -> 120]][[1]]

CROSSREFS

Cf. A173938.

Sequence in context: A073240 A019853 A007332 * A131691 A258504 A273816

Adjacent sequences:  A246038 A246039 A246040 * A246042 A246043 A246044

KEYWORD

nonn,cons

AUTHOR

Vaclav Kotesovec, Aug 23 2014

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 11 07:38 EST 2019. Contains 329914 sequences. (Running on oeis4.)