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

1,2

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

Mathematica

Mod[(10^#[[1]]+10^#[[2]]+1)/3&/@Tuples[Range[0, 12], 2]//Union, 10] (* Harvey P. Dale, Sep 16 2025 *)

Prog

(Haskell)
a254398 = flip mod 10 . a237424

Crossrefs

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

Sequence in context: A112677 A010712 A259499 * A081884 A059143 A094765

Adjacent sequences: A254395 A254396 A254397 * A254399 A254400 A254401

Keyword

nonn,base

Author

Reinhard Zumkeller, Feb 23 2015

Status

approved