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

1,2

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

(Haskell)
a254397 = a000030 . a237424

Crossrefs

Cf. A237424, A000030, A254339.

Sequence in context: A118826 A330924 A165663 * A197697 A241026 A198743

Adjacent sequences: A254394 A254395 A254396 * A254398 A254399 A254400

Keyword

nonn,base

Author

Reinhard Zumkeller, Feb 23 2015

Status

approved