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 A057978 #33 Feb 06 2019 04:53:47 %S A057978 2,5,89,1212,13863,150232,1574973,16246940,165826606,1681871718, %T A057978 16988116409,171128671374 %N A057978 Number of untouchable numbers <= 10^n. %H A057978 K. Chum, R. K. Guy, M. J. Jacobson, Jr., and A. S. Mosunov, <a href="https://doi.org/10.1080/10586458.2018.1477077">Numerical and statistical analysis of aliquot sequences</a>, Experimental Mathematics (2018), pp. 1-12. %H A057978 Paul Pollack and Carl Pomerance, <a href="http://dx.doi.org/10.1090/btran/10">Some problems of Erdős on the sum-of-divisors function</a>, Transactions of the American Mathematical Society, Series B Vol. 3, No. 1 (2016), pp. 1-26. %H A057978 Carl Pomerance and Hee-Sung Yang, <a href="http://doi.org/10.1090/S0025-5718-2013-02775-5">Variant of a theorem of Erdős on the sum-of-proper-divisors function</a>, Mathematics of Computation, Vol. 83, No. 288 (2014), pp. 1903-1913. %H A057978 <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes in various ranges</a> %Y A057978 Cf. A005114. %K A057978 more,nonn %O A057978 1,1 %A A057978 _Naohiro Nomoto_, Nov 13 2000 %E A057978 a(5)-a(6) from _Donovan Johnson_, Jul 19 2008 %E A057978 a(7) from _Donovan Johnson_, Aug 13 2011 %E A057978 a(8)-a(10) from _Amiram Eldar_; a(8) was taken from the paper by Pomerance and Yang, a(9)-a(10) were taken from the paper by Pollack and Pomerance %E A057978 a(11)-a(12) added by _Amiram Eldar_, Sep 29 2018 from the paper by Chum et al.