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

Offset: 1

Author

Reinhard Zumkeller, Feb 23 2015

Keywords

• nonn
• base

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

• Index entries for sequences related to final digits of numbers

Crossrefs

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

Programs

Haskell

a254398 = flip mod 10 . a237424