login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A296497 Decimal expansion of ratio-sum for A294541; see Comments. 3
3, 4, 8, 9, 8, 0, 1, 8, 3, 9, 1, 6, 5, 1, 8, 0, 8, 8, 3, 9, 3, 9, 5, 8, 4, 0, 8, 2, 8, 8, 2, 5, 7, 1, 7, 2, 3, 7, 6, 9, 1, 6, 5, 8, 1, 9, 0, 7, 5, 4, 7, 8, 7, 6, 4, 0, 7, 4, 9, 9, 5, 3, 8, 4, 0, 5, 7, 0, 2, 8, 6, 8, 7, 8, 0, 0, 5, 7, 0, 3, 3, 7, 8, 9, 5, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Suppose that A = (a(n)), for n >= 0, is a sequence, and g is a real number such that a(n)/a(n-1) -> g. The ratio-sum for A is |a(1)/a(0) - g| + |a(2)/a(1) - g| + . . . , assuming that this series converges. For A = A294541, we have g = (1 + sqrt(5))/2, the golden ratio (A001622). See the guide at A296469 for related sequences.

LINKS

Table of n, a(n) for n=1..86.

EXAMPLE

3.489801839165180883939584082882571723769...

MATHEMATICA

a[0] = 1; a[1] = 2; b[0] = 3; b[1] = 4;

a[n_] := a[n] = a[n - 1] + a[n - 2] + b[n - 1] + b[n - 2];

j = 1; While[j < 13, k = a[j] - j - 1;

While[k < a[j + 1] - j + 1, b[k] = j + k + 2; k++]; j++];

Table[a[n], {n, 0, k}]; (* A294541 *)

g = GoldenRatio; s = N[Sum[- g + a[n]/a[n - 1], {n, 1, 1000}], 200]

Take[RealDigits[s, 10][[1]], 100]  (* A296497 *)

CROSSREFS

Cf. A001622, A294541, A296284, A296498.

Sequence in context: A075562 A316137 A089290 * A019811 A075746 A275096

Adjacent sequences:  A296494 A296495 A296496 * A296498 A296499 A296500

KEYWORD

nonn,easy,cons

AUTHOR

Clark Kimberling, Dec 20 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 10:39 EST 2020. Contains 332134 sequences. (Running on oeis4.)