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Final digits of A237424 in decimal representation.
2

%I #7 Jul 11 2024 20:49:09

%S 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 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 7,7,7,7,7,7,7,7,7,7,4,7,7,7,7,7,7,7

%N Final digits of A237424 in decimal representation.

%C a(n) = A237424(n) mod 10;

%C n with a(n) = 4: A237424(n) = (10^a+10^b+1)/3 with b = 0, see also A093137, A133384;

%C n with a(n) = 7: A237424(n) = (10^a+10^b+1)/3 with 0 < b <= a;

%C length of k-th run of consecutive 7s = k;

%C digits 0, 2, 3, 5, 6, 8 and 9 do not occur.

%H <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a>

%o (Haskell)

%o a254398 = flip mod 10 . a237424

%Y Cf. A237424, A010879, A254339, A093137, A133384.

%K nonn,base

%O 1,2

%A _Reinhard Zumkeller_, Feb 23 2015