A102861 Numbers which in base 5 have digit-sum 4.

4, 8, 12, 16, 20, 28, 32, 36, 40, 52, 56, 60, 76, 80, 100, 128, 132, 136, 140, 152, 156, 160, 176, 180, 200, 252, 256, 260, 276, 280, 300, 376, 380, 400, 500, 628, 632, 636, 640, 652, 656, 660, 676, 680, 700, 752, 756, 760, 776, 780, 800, 876, 880, 900, 1000

Offset

1,1

Comments

Or, sums of four powers of 5.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

The author would like a formula for the n-th term.

Example

In base 5 the numbers are 4, 13, 31, 40, 103, 112, 121, 130, 202, 211, 220, 301, 310, 400, 1003, ...

Maple

for n from 0 to 2500 do if coeff(series(add(x^(5^i), i=0..4)^4, x, 2500), x, n)<>0 then printf(`%d, `, n); fi:od:

Mathematica

Select[Range[1000], Total[IntegerDigits[#, 5]]==4&] (* Harvey P. Dale, Jul 13 2023 *)

Crossrefs

Cf. A055235.

Sequence in context: A311235 A311236 A311237 * A357357 A311238 A311239

Adjacent sequences: A102858 A102859 A102860 * A102862 A102863 A102864

Keyword

nonn,base,easy

Author

Sergi Adamchuk (adamchuk(AT)gmail.com), Mar 15 2005

Extensions

More terms from Joshua Zucker, May 15 2006

Status

approved