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 A089825 #19 Oct 19 2017 10:43:03 %S A089825 9,2047,1373653,134670080641,25326001,307768373641,3215031751, %T A089825 1502401849747176241,2152302898747,1478868544880821, %U A089825 3034679039109989281,3474749660383 %N A089825 Smallest n such that the least witness function W(n) = m, as m runs through the values in A089105. %C A089825 The least witness of 3825123056546413051 is 37, and no smaller number has 37 as its least witness. [_Charles R Greathouse IV_, Aug 14 2010] %D A089825 R. Crandall and C. Pomerance, Prime Numbers: A Computational Perspective, Springer, NY, 2001; see p. 157 (p. 168 in the second printing). %e A089825 Comment from _Don Reble_, May 27 2014: The sequence begins: %e A089825 2 9 %e A089825 3 2047 %e A089825 5 1373653 %e A089825 6 134670080641 %e A089825 7 25326001 %e A089825 10 307768373641 %e A089825 11 3215031751 %e A089825 12 1502401849747176241 %e A089825 13 2152302898747 %e A089825 14 1478868544880821 %e A089825 15 3034679039109989281 %e A089825 17 3474749660383 %e A089825 18 ? %e A089825 19 4498414682539051 %e A089825 20 ? %e A089825 21 ? %e A089825 22 16043083915816662841 %e A089825 23 341550071728321 %Y A089825 Cf. A089105. %K A089825 nonn,hard,more %O A089825 1,1 %A A089825 _N. J. A. Sloane_, Jan 18 2004 %E A089825 a(8)-a(13) from _Charles R Greathouse IV_, Aug 14 2010 %E A089825 Corrected by _Don Reble_, May 27 2014