A014889 n is equal to the number of 5s in all numbers <= n written in base 7.

761664, 817499, 817500, 817507, 817508, 819609, 823543, 1585207, 1641042, 1641043, 1641050, 1641051, 1643152, 1647086, 2408750, 2464585, 2464586, 2464593, 2464594, 2466695, 2470629, 3232293, 3288128, 3288129, 3288136, 3288137, 3290238, 3294172, 4055836, 4111671, 4111672, 4111679, 4111680, 4113781

Offset

1,1

Links

Table of n, a(n) for n=1..34.

Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 1, -1).

Formula

a(n) = a(n-1) + a(n-7) - a(n-8) for 8 < n <= 34. - Chai Wah Wu, Jun 06 2016

Mathematica

LinearRecurrence[{1, 0, 0, 0, 0, 0, 1, -1}, {761664, 817499, 817500, 817507, 817508, 819609, 823543, 1585207}, 34] (* Harvey P. Dale, Apr 14 2020 *)

Crossrefs

Cf. A014778.

Sequence in context: A137468 A183825 A254074 * A014888 A234990 A043673

Adjacent sequences: A014886 A014887 A014888 * A014890 A014891 A014892

Keyword

nonn,base,fini,full

Author

Olivier Gérard

Extensions

List proved complete by Hugo van der Sanden (cf. A014886).

Status

approved