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

Offset: 1

Author

Reinhard Zumkeller, Feb 23 2015

Keywords

• nonn
• base

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

Crossrefs

Cf. A237424, A000030, A254339.

Programs

Haskell

a254397 = a000030 . a237424