A061425 Sum of digits = 8 times number of digits.

8, 79, 88, 97, 699, 789, 798, 879, 888, 897, 969, 978, 987, 996, 5999, 6899, 6989, 6998, 7799, 7889, 7898, 7979, 7988, 7997, 8699, 8789, 8798, 8879, 8888, 8897, 8969, 8978, 8987, 8996, 9599, 9689, 9698, 9779, 9788, 9797, 9869, 9878, 9887, 9896, 9959

Offset: 1

Author

Amarnath Murthy, May 03 2001

Keywords

• nonn
• base
• easy

Examples

			879 is a term as the arithmetic mean of the digits is (8+7+9)/3 = 8.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A061383-A061388, A061423-A061424.

Programs

Maple

Q:= proc(n,t) option remember; local j,R;
      if t > 9*n or t <= 0 then return [] fi;
      R:= NULL;
      for j from 0 to min(t,9) do
        R:= R, op(map(s -> 10*s+j, procname(n-1,t-j)))
      od;
      [R]
end proc;
for i from 0 to 9 do Q(1,i):= [i] od:
seq(op(sort(Q(d,8*d))),d=1..4); # Robert Israel, Dec 07 2020

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001