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 A322650 Number of times the digit 9 appears in the first 10^n decimal digits of sqrt(2), sometimes called Pythagoras's constant, counting after the decimal point. 10
 0, 8, 92, 1019, 9945, 100121, 1000566, 10000056, 99996852, 999989494 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS It is not known if sqrt(2) is normal, but the distribution of decimal digits found for the first 10^n digits of sqrt(2) shows no statistically significant departure from a uniform distribution. LINKS Eric Weisstein's World of Mathematics, Pythagoras's Constant Digits. MAPLE a:=proc(n)   local digits, SQRT2, C, i;   digits:=10^n+100;   SQRT2:=convert(frac(evalf[digits](sqrt(2))), string)[2..digits-99];   C:=0;   for i from 1 to length(SQRT2) do     if SQRT2[i]="9" then C:=C+1; fi;   od;   return(C); end; MATHEMATICA Table[DigitCount[IntegerPart[(Sqrt-1)*10^10^n], 10, 9], {n, 1, 10}] (* Robert Price, Mar 29 2019 *) CROSSREFS Cf. A002193, A099300, A322641, A322642, A322643, A322644, A322645, A322646, A322647, A322648, A322649. Sequence in context: A222400 A280159 A155615 * A221765 A292842 A133271 Adjacent sequences:  A322647 A322648 A322649 * A322651 A322652 A322653 KEYWORD nonn,base,more AUTHOR Martin Renner, Dec 21 2018 STATUS approved

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Last modified May 6 09:25 EDT 2021. Contains 343580 sequences. (Running on oeis4.)