This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A292122 E.g.f. B(x) satisfies: B'(x) = A(x)*C(x) such that B(x)^2 - A(x)^2 = 3 and C(x)^2 - B(x)^2 = 5, where A(x) and C(x) are the e.g.f.s of A292121 and A292123, respectively. 5
 2, 3, 20, 78, 736, 6672, 83360, 1113072, 17810944, 311847168, 6167567360, 132939299328, 3142344933376, 80224248225792, 2209481228472320, 65134576849385472, 2049303151562850304, 68484117776544104448, 2423689450690189721600, 90531454034353494294528, 3559791292388307701334016, 146968393370524340544602112, 6356752154870738583164026880, 287439789131448083136535068672, 13562654176394604163638350577664 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Paul D. Hanna, Table of n, a(n) for n = 0..300 FORMULA E.g.f. B(x) and related functions A(x) and C(x) satisfy: (1a) A(x) = 1 + Integral B(x)*C(x) dx. (1b) B(x) = 2 + Integral A(x)*C(x) dx. (1c) C(x) = 3 + Integral A(x)*B(x) dx. (2a) B(x)^2 - A(x)^2 = 3. (2b) C(x)^2 - A(x)^2 = 8. (2c) C(x)^2 - B(x)^2 = 5. (3a) A(x) = (B'(x) + C'(x))/(B(x) + C(x)). (3b) B(x) = (C'(x) + A'(x))/(C(x) + A(x)). (3c) C(x) = (A'(x) + B'(x))/(A(x) + B(x)). (4a) A(x) + B(x) = 3 * exp( Integral C(x) dx ). (4b) A(x) + C(x) = 4 * exp( Integral B(x) dx ). (4c) B(x) + C(x) = 5 * exp( Integral A(x) dx ). (5a) A(x) = (-5*exp(Integral A(x) dx) + 4*exp(Integral B(x) dx) + 3*exp(Integral C(x) dx))/2. (5b) B(x) = (5*exp(Integral A(x) dx) - 4*exp(Integral B(x) dx) + 3*exp(Integral C(x) dx))/2. (5c) C(x) = (5*exp(Integral A(x) dx) + 4*exp(Integral B(x) dx) - 3*exp(Integral C(x) dx))/2. (6a) A(x)^m = 1 + Integral m * A(x)^(m-1) * B(x) * C(x) dx. (6b) B(x)^m = 2^m + Integral m * A(x) * B(x)^(m-1) * C(x) dx. (6c) C(x)^m = 3^m + Integral m * A(x) * B(x) * C(x)^(m-1) dx. EXAMPLE E.g.f. B(x) = 2 + 3*x + 20*x^2/2! + 78*x^3/3! + 736*x^4/4! + 6672*x^5/5! + 83360*x^6/6! + 1113072*x^7/7! + 17810944*x^8/8! + 311847168*x^9/9! + 6167567360*x^10/10! +... Related series. A(x) = 1 + 6*x + 13*x^2/2! + 102*x^3/3! + 653*x^4/4! + 7134*x^5/5! + 80257*x^6/6! + 1138638*x^7/7! + 17577977*x^8/8! + 314204406*x^9/9! + 6141247573*x^10/10! +... where B(x)^2 - A(x)^2 = 3. C(x) = 3 + 2*x + 15*x^2/2! + 82*x^3/3! + 759*x^4/4! + 6698*x^5/5! + 83355*x^6/6! + 1111018*x^7/7! + 17804811*x^8/8! + 311922962*x^9/9! + 6167999175*x^10/10! +... where C(x)^2 - B(x)^2 = 5. A(x) + B(x) = 3 + 9*x + 33*x^2/2! + 180*x^3/3! + 1389*x^4/4! + 13806*x^5/5! + 163617*x^6/6! + 2251710*x^7/7! + 35388921*x^8/8! + 626051574*x^9/9! + 12308814933*x^10/10! +... where A(x) + B(x) =  (A'(x) + B'(x)) / C(x). A(x) + C(x) = 4 + 8*x + 28*x^2/2! + 184*x^3/3! + 1412*x^4/4! + 13832*x^5/5! + 163612*x^6/6! + 2249656*x^7/7! + 35382788*x^8/8! + 626127368*x^9/9! + 12309246748*x^10/10! +... where A(x) + C(x) =  (A'(x) + C'(x)) / B(x). B(x) + C(x) = 5 + 5*x + 35*x^2/2! + 160*x^3/3! + 1495*x^4/4! + 13370*x^5/5! + 166715*x^6/6! + 2224090*x^7/7! + 35615755*x^8/8! + 623770130*x^9/9! + 12335566535*x^10/10! +... where B(x) + C(x) =  (B'(x) + C'(x)) / A(x). PROG (PARI) {a(n) = my(A=1, B=2, C=3); for(i=0, n, A = 1 + intformal(B*C +x*O(x^n)); B = 2 + intformal(A*C); C = 3 + intformal(A*B)); n!*polcoeff(B, n)} for(n=0, 30, print1(a(n), ", ")) CROSSREFS Cf. A292120 (A+B+C), A292121 (A), A292123 (C), A292124 (A*B*C). Sequence in context: A151370 A041567 A087301 * A264417 A066166 A007113 Adjacent sequences:  A292119 A292120 A292121 * A292123 A292124 A292125 KEYWORD nonn AUTHOR Paul D. Hanna, Sep 08 2017 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.

Last modified July 23 11:44 EDT 2019. Contains 325254 sequences. (Running on oeis4.)