A025718 Index of 6^n within sequence of numbers of form 6^i*9^j.

1, 2, 4, 7, 11, 16, 21, 27, 34, 42, 51, 60, 70, 81, 93, 106, 120, 134, 149, 165, 182, 200, 218, 237, 257, 278, 300, 323, 346, 370, 395, 421, 448, 475, 503, 532, 562, 593, 624, 656, 689, 723, 758, 794, 830, 867, 905, 944, 984, 1024, 1065, 1107, 1150, 1194, 1239, 1284

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

Positions of zeros in A025680. - R. J. Mathar, Jul 06 2025

Links

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

Crossrefs

Cf. A025628.

Programs

Maple

with(priqueue):
initialize(PQ):
insert([-1,0,0],PQ):
count:= 0: R:= NULL:
for i from 1 while count < 100 do
  v:= extract(PQ);
if v[3] = 0 then R:= R,i; count:= count+1; insert([v[1]*6,v[2]+1,0],PQ);
insert([v[1]*9, v[2], v[3]+1],PQ)
od:
R; # Robert Israel, Jan 21 2024