A296844 Decimal expansion of ratio-sum for A296843; see Comments.

4, 4, 6, 5, 2, 0, 5, 2, 9, 3, 4, 2, 0, 7, 5, 5, 5, 3, 6, 4, 1, 2, 6, 7, 8, 3, 7, 3, 0, 1, 3, 0, 3, 6, 0, 4, 6, 4, 1, 5, 6, 3, 1, 6, 5, 1, 8, 4, 3, 6, 4, 9, 4, 0, 1, 2, 2, 3, 2, 7, 5, 6, 0, 2, 4, 7, 3, 1, 7, 4, 6, 3, 8, 9, 3, 0, 4, 6, 8, 4, 0, 7, 6, 1, 0, 0

Offset: 1

Author

Clark Kimberling, Jan 12 2018

Keywords

• nonn
• easy
• cons

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 = A296843, we have g = (1 + sqrt(5))/2, the golden ratio (A001622). See A296425..A296434 for related ratio-sums and A296452..A296461 for related limiting power-ratios.

Examples

			ratio-sum = 4.465205293420755536412678373013036046415...
		

Crossrefs

Cf. A001622, A296843, A296845.

Programs

Mathematica

a[0] = 1; a[1] = 2; b[0] = 3; b[1] = 4; b[2] = 5; b[3] = 6;
a[n_] := a[n] = a[n - 1] + a[n - 2] + b[n + 1];
j = 1; While[j < 16, k = a[j] - j - 1;
While[k < a[j + 1] - j + 1, b[k] = j + k + 2; k++]; j++];
u = Table[a[n], {n, 0, k}];  (* A296843 *)
GoldenRatio; s = N[Sum[-g + a[n]/a[n - 1], {n, 1, 1000}], 200];
StringJoin[StringTake[ToString[s], 41], "..."]
Take[RealDigits[s, 10][[1]], 100] (* A296844 *)