A280532 a(1) = a(2) = 1, a(n) = A014777(a(n-1) + a(n-2)), n >= 3.

1, 1, 6, 13, 37, 31, 605, 1411, 7174, 15567, 608953, 78903, 334535, 611552, 105928, 2557047, 2979162, 3263358, 6242520, 7825254, 37404834, 267494881, 639174488

Offset: 1

Author

Anders Hellström, Jan 13 2017

Keywords

• nonn
• base
• more

Links

• Dave Andersen, Probability of Finding Strings In Pi
• Anders Hellström, Sage program
• James Taylor, Irrational Numbers Search Engine (Search 2*10^9 decimal digits of Pi)

Crossrefs

Cf. A014777, A032445, A038100, A176341, A232013.

Programs

Mathematica

Module[{a = {1, 1}, s = First@ RealDigits[N[Pi, 10^7]]}, Do[AppendTo[a, -1 + SequencePosition[s, IntegerDigits[ a[[n - 1]] + a[[n - 2]] ]][[1, 1]]], {n, 3, 20}]; a] (* Michael De Vlieger, Jan 14 2017 *)