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 A091716 #11 Sep 23 2014 17:25:33 %S A091716 2,29,298,2962,29412,292821,2921863,29170821,291324189,2910238255, %T A091716 29078387910,290589147156,2904276036695 %N A091716 Standard deviation (rounded) of primes below 10^n. %C A091716 It appears that a good estimate for the standard deviation of primes below 10^(n+1) is about 10 times the term for 10^n. %C A091716 Heuristically, if we use a model where each positive integer x has probability approximately 1/log(x) of being prime, we should expect the standard deviation of the primes below N to be approximately N/sqrt(12). - _Robert Israel_, Sep 23 2014 %D A091716 John E. Freund, Modern elementary statistics, 5th ed. (Prentice-Hall, 1979), pp. 42-47 %e A091716 a(6) = 292821 (rounded from 292820.634) because this is the computed and rounded sample standard deviation of the 78498 primes below 10^6. %p A091716 seq(round(Statistics:-StandardDeviation(select(isprime, [$2 .. 10^n-1]))),n=1..7); # _Robert Israel_, Sep 23 2014 %Y A091716 Cf. A092800, A092801, A092802. %K A091716 nonn,more %O A091716 1,1 %A A091716 _Enoch Haga_, Mar 05 2004 %E A091716 a(9)-a(13) from _Hiroaki Yamanouchi_, Sep 23 2014