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 A154947 #15 Feb 15 2025 16:38:25 %S A154947 1,3,1,5,4,6,4,8,7,6,7,8,5,7,2,8,7,1,8,5,4,9,7,6,3,5,5,7,1,7,1,3,8,0, %T A154947 4,2,7,1,4,9,7,9,2,8,2,0,0,6,5,9,4,0,2,1,3,9,3,5,3,2,7,4,7,1,9,1,9,3, %U A154947 4,2,6,0,0,6,9,0,4,5,7,4,0,2,5,3,0,5,8,6,3,4,4,2,7,4,7,2,5,8,7 %N A154947 Decimal expansion of log_9 (18). %H A154947 Vincenzo Librandi, <a href="/A154947/b154947.txt">Table of n, a(n) for n = 1..1000</a> %H A154947 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A154947 Equals 1+A152747. - _R. J. Mathar_, Jan 07 2021 %F A154947 Equals A153495+1/2. - _R. J. Mathar_, Feb 15 2025 %e A154947 1.3154648767857287185497635571713804271497928200659402139353... %t A154947 RealDigits[Log[9, 18], 10, 100][[1]] (* _Vincenzo Librandi_, Sep 01 2013 *) %o A154947 (PARI) default(realprecision, 100); log(18)/log(9) \\ _G. C. Greubel_, Sep 01 2018 %o A154947 (Magma) SetDefaultRealField(RealField(100)); Log(18)/Log(9); // _G. C. Greubel_, Sep 01 2018 %Y A154947 Cf. decimal expansion of log_9(m): A152747 (m=2), A153205 (m=5), A153495 (m=6), A153619 (m=7), A153756 (m=8), A154160 (m=10), A154181 (m=11), A154202 (m=12), A154339 (m=13), A154469 (m=14), A154578 (m=15), A154859 (m=17), this sequence, A155061 (m=19), A155503 (m=20), A155676 (m=21), A155743 (m=22), A155829 (m=23), A155976 (m=24). %K A154947 nonn,cons %O A154947 1,2 %A A154947 _N. J. A. Sloane_, Oct 30 2009