A254397 - OEIS

A254397

Initial digits of A237424 in decimal representation.

1, 4, 7, 3, 3, 6, 3, 3, 3, 6, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 3, 3, 3

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OFFSET

1,2

COMMENTS

a(n) = A000030(A237424(n));

n with a(n) = 3: A237424(n) = (10^a+10^b+1)/3 with 0 <= b < a, see also A014132;

n with a(n) = 6: A237424(n) = (10^a+10^b+1)/3 with a = b, see also A199682, A254338;

length of k-th run of consecutive 3s = k+1, k > 0;

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

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

PROG