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Positions where 3 occurs in decimal expansion of e (starting count at decimal point).
0

%I #25 Oct 04 2024 11:18:57

%S 17,19,28,45,71,73,75,85,106,110,114,126,135,142,143,155,158,161,163,

%T 171,177,179,180,189,204,206,212,227,270,274,281,287,311,319,320,322,

%U 327,338,339,353,357,364,375,383,394,404,423,433,447,482,485,491,498

%N Positions where 3 occurs in decimal expansion of e (starting count at decimal point).

%H Carlos M. da Fonseca and Anthony G. Shannon, <a href="https://doi.org/10.7546/nntdm.2024.30.3.491-498">A formal operator involving Fermatian numbers</a>, Notes Num. Theor. Disc. Math. (2024) Vol. 30, No. 3, 491-498.

%F a(n) = A054279(n) - 1.

%e 3 first occurs at the 17th position to the right of the decimal point.

%t Flatten[Position[Rest[RealDigits[E,10,600][[1]]],3]] (* _Harvey P. Dale_, Jun 28 2011 *)

%Y Cf. A001113, A054279.

%K easy,nonn,base

%O 0,1

%A _Enoch Haga_, Feb 16 2000