A296493 Decimal expansion of ratio-sum for A296555; see Comments.

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

Offset: 1

Author

Clark Kimberling, Dec 19 2017

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 = A296555, we have g = (1 + sqrt(5))/2, the golden ratio (A001622). See the guide at A296469 for related sequences.

Examples

			5.204091649313251611130187115558413050194...
		

Crossrefs

Cf. A001622, A296284, A296494, A296555.

Programs

Mathematica

a[0] = 1; a[1] = 2; b[0] = 3; b[1] = 4; b[2] = 5;
a[n_] := a[n] = a[n - 1] + a[n - 2] + b[n] + n;
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}]; (* A296555 *)
g = GoldenRatio; s = N[Sum[- g + a[n]/a[n - 1], {n, 1, 1000}], 200]
Take[RealDigits[s, 10][[1]], 100]  (* A296493 *)