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%I #41 Feb 06 2017 02:11:13
%S 1,1,6,13,37,31,605,1411,7174,15567,608953,78903,334535,611552,105928,
%T 2557047,2979162,3263358,6242520,7825254,37404834,267494881,639174488
%N a(1) = a(2) = 1, a(n) = A014777(a(n-1) + a(n-2)), n >= 3.
%H Dave Andersen, <a href="http://www.angio.net/pi/whynotpi.html">Probability of Finding Strings In Pi</a>
%H Anders Hellström, <a href="/A280532/a280532.spyx.txt">Sage program</a>
%H James Taylor, <a href="http://www.subidiom.com/pi/">Irrational Numbers Search Engine</a> (Search 2*10^9 decimal digits of Pi)
%t 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 *)
%Y Cf. A014777, A032445, A038100, A176341, A232013.
%K nonn,base,more
%O 1,3
%A _Anders Hellström_, Jan 13 2017