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A254398 Final digits of A237424 in decimal representation.

%I A254398 #7 Jul 11 2024 20:49:09
%S A254398 1,4,7,4,7,7,4,7,7,7,4,7,7,7,7,4,7,7,7,7,7,4,7,7,7,7,7,7,4,7,7,7,7,7,
%T A254398 7,7,4,7,7,7,7,7,7,7,7,4,7,7,7,7,7,7,7,7,7,4,7,7,7,7,7,7,7,7,7,7,4,7,
%U A254398 7,7,7,7,7,7,7,7,7,7,4,7,7,7,7,7,7,7
%N A254398 Final digits of A237424 in decimal representation.
%C A254398 a(n) = A237424(n) mod 10;
%C A254398 n with a(n) = 4: A237424(n) = (10^a+10^b+1)/3 with b = 0, see also A093137, A133384;
%C A254398 n with a(n) = 7: A237424(n) = (10^a+10^b+1)/3 with 0 < b <= a;
%C A254398 length of k-th run of consecutive 7s = k;
%C A254398 digits 0, 2, 3, 5, 6, 8 and 9 do not occur.
%H A254398 <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a>
%o A254398 (Haskell)
%o A254398 a254398 = flip mod 10 . a237424
%Y A254398 Cf. A237424, A010879, A254339, A093137, A133384.
%K A254398 nonn,base
%O A254398 1,2
%A A254398 _Reinhard Zumkeller_, Feb 23 2015