cp's OEIS Frontend

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.

A170827 Sum of digits after the decimal point in the decimal expansion of (3/2)^n.

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%I A170827 #20 Jan 09 2023 02:25:08
%S A170827 0,5,7,15,13,29,25,37,38,43,42,67,60,67,60,85,73,77,71,79,95,107,106,
%T A170827 100,95,120,95,137,143,146,138,140,147,166,172,163,172,177,180,193,
%U A170827 158,174,171,184,177,188,188,223,212,241,213,198,243,229,236,245,278,281,305,304
%N A170827 Sum of digits after the decimal point in the decimal expansion of (3/2)^n.
%C A170827 Some terms appear more than once, 60 being the first. - _Robert G. Wilson v_, Mar 10 2015
%H A170827 Harvey P. Dale, <a href="/A170827/b170827.txt">Table of n, a(n) for n = 0..1000</a>
%e A170827 1.0
%e A170827 1.5
%e A170827 2.25
%e A170827 3.375
%e A170827 5.0625
%e A170827 7.59375
%e A170827 11.390625
%e A170827 17.0859375
%e A170827 25.62890625
%t A170827 td[n_]:=Module[{rd=RealDigits[(3/2)^n]},Total[Drop[rd[[1]], rd[[2]]]]]; Array[td,60,0] (* _Harvey P. Dale_, Dec 13 2011 *)
%o A170827 (PARI) a(n) = sumdigits(lift(Mod(15,10^n)^n)) \\ _Jianing Song_, Sep 28 2022
%Y A170827 Cf. A002379, A170828.
%K A170827 nonn,base
%O A170827 0,2
%A A170827 _Michel Lagneau_, Dec 28 2009
%E A170827 Edited by _N. J. A. Sloane_, Dec 28 2009