This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A260315 #42 Jan 09 2025 09:59:41 %S A260315 1,9,6,6,8,9,1,7,6,1,7,9,0,1,7,6,3,6,5,3,3,3,5,0,5,7,2,0,2,2,6,6,9,8, %T A260315 2,7,6,1,3,2,2,1,2,1,1,8,6,8,6,3,3,5,3,4,2,2,0,1,8,5,8,2,8,8,3,1,2,6, %U A260315 2,5,6,4,4,2 %N A260315 Decimal expansion of the generating constant c of A139244. %C A260315 A139244(n-1) = ceiling(c^(2^n)). %C A260315 The digit 4 appears for the first time only at position n=53, making it the last one to appear in the sequence. %H A260315 A. V. Aho and N. J. A. Sloane, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/11-4/aho-a.pdf">Some doubly exponential sequences</a>, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437. %H A260315 A. V. Aho and N. J. A. Sloane, <a href="/A000058/a000058.pdf">Some doubly exponential sequences</a>, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437 (original plus references that F.Q. forgot to include - see last page!) %e A260315 1.96689176179017636533350572... . %Y A260315 Cf. A139244. %K A260315 nonn,cons %O A260315 1,2 %A A260315 _Chayim Lowen_, Jul 22 2015