|
| |
|
|
A050727
|
|
Decimal expansion of 6^n contains no pair of consecutive equal digits (probably finite).
|
|
1
|
|
|
|
0, 1, 2, 3, 4, 8, 11, 13, 14, 15, 26
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
COMMENTS
|
No additional terms up to 25000. - Harvey P. Dale, Oct 17 2011
No additional terms up to 100000. - Michel Marcus, Oct 16 2019
|
|
|
LINKS
|
Table of n, a(n) for n=1..11.
|
|
|
EXAMPLE
|
6^26 = 170581728179578208256 where no consecutive digits are equal.
|
|
|
MATHEMATICA
|
Select[Range[120], !MemberQ[Differences[IntegerDigits[6^#]], 0]&] (* Harvey P. Dale, Oct 17 2011 *)
|
|
|
PROG
|
(PARI) isok(n) = {my(d = digits(6^n), c = d[1]); for (i=2, #d, if (d[i] == c, return (0)); c = d[i]; ); return (1); } \\ Michel Marcus, Oct 16 2019
|
|
|
CROSSREFS
|
Cf. A000400, A030702, A046264, A046272.
Sequence in context: A106131 A275646 A279194 * A295323 A102951 A015935
Adjacent sequences: A050724 A050725 A050726 * A050728 A050729 A050730
|
|
|
KEYWORD
|
nonn,base,more
|
|
|
AUTHOR
|
Patrick De Geest, Sep 15 1999
|
|
|
STATUS
|
approved
|
| |
|
|
