A254398 - OEIS

A254398

Final digits of A237424 in decimal representation.

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, 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, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 4, 7, 7, 7, 7, 7, 7, 7

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OFFSET

1,2

COMMENTS

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

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

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

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

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

LINKS

Table of n, a(n) for n=1..86.

Index entries for sequences related to final digits of numbers