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A091681 Decimal expansion of BesselJ(0,2). 10
2, 2, 3, 8, 9, 0, 7, 7, 9, 1, 4, 1, 2, 3, 5, 6, 6, 8, 0, 5, 1, 8, 2, 7, 4, 5, 4, 6, 4, 9, 9, 4, 8, 6, 2, 5, 8, 2, 5, 1, 5, 4, 4, 8, 2, 2, 1, 8, 6, 0, 7, 6, 0, 3, 1, 2, 8, 3, 4, 9, 7, 0, 6, 0, 1, 0, 8, 5, 3, 9, 5, 7, 7, 6, 8, 0, 1, 0, 7, 0, 5, 0, 1, 4, 8, 1, 1, 5, 1, 1, 8, 5, 3, 4, 2, 9, 3, 6, 6, 0, 4, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Sum_{k>=0} (-1)^k/(k!)^2.

The Pierce Expansion of this number is the squares > 1: 4,9,16,25,... - Franklin T. Adams-Watters, May 22 2006

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..2500

Eric Weisstein's World of Mathematics, Factorial Sums

Eric Weisstein's World of Mathematics, Pierce Expansion

FORMULA

Continued fraction expansion: BesselJ(0,2) = 1/(4 + 4/(8 + 9/(15 + ... + (n - 1)^2/(n^2 + 1 + ...)))). See A073701 for a proof. - Peter Bala, Feb 01 2015

EXAMPLE

0.223890779...

MATHEMATICA

RealDigits[N[BesselJ[0, 2], 250]][[1]] (* G. C. Greubel, Dec 26 2016 *)

PROG

(PARI) besselj(0, 2) \\ Charles R Greathouse IV, Feb 19 2014

CROSSREFS

Cf A000290, A068985, A073701.

Sequence in context: A046652 A319860 A300354 * A076541 A227380 A159789

Adjacent sequences:  A091678 A091679 A091680 * A091682 A091683 A091684

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Jan 28 2004

STATUS

approved

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Last modified July 12 11:25 EDT 2020. Contains 335658 sequences. (Running on oeis4.)