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 A322722 Number of times the digit 7 appears in the first 10^n decimal digits of Euler's number e = exp(1), counting starts after the decimal point. 9
 1, 16, 99, 1008, 9875, 99910, 1000813, 9998342, 99997536, 1000013049 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS It is not known if e is normal, but the distribution of decimal digits found for the first 10^n digits of e shows no statistically significant departure from a uniform distribution. LINKS Table of n, a(n) for n=1..10. Eric Weisstein's World of Mathematics, e Digits. MAPLE a:=proc(n) local digits, EXP1, C, i; digits:=10^n+100; EXP1:=convert(frac(evalf[digits](exp(1))), string)[2..digits-99]; C:=0; for i from 1 to length(EXP1) do if EXP1[i]="7" then C:=C+1; fi; od; return(C); end; MATHEMATICA Table[Count[IntegerDigits[IntegerPart[(E - 2)*10^10^n]], 7], {n, 7}] (* Robert Price, Apr 07 2019 *) CROSSREFS Cf. A001113, A099298, A322648, A322715, A322716, A322717, A322718, A322719, A322720, A322721, A322723, A322724. Sequence in context: A283545 A297684 A344866 * A014762 A045784 A354877 Adjacent sequences: A322719 A322720 A322721 * A322723 A322724 A322725 KEYWORD nonn,base,more AUTHOR Martin Renner, Dec 24 2018 STATUS approved

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Last modified June 13 22:21 EDT 2024. Contains 373391 sequences. (Running on oeis4.)