

A107583


a(n) = 3^n  3*n.


11



1, 0, 3, 18, 69, 228, 711, 2166, 6537, 19656, 59019, 177114, 531405, 1594284, 4782927, 14348862, 43046673, 129140112, 387420435, 1162261410, 3486784341
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,3


COMMENTS

a(n) is the number k such that the number m with n 3's and k 1's has digit product = digit sum = 3^n.


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000


EXAMPLE

Corresponding numbers m are 1, 3, 11133, 111111111111111111333, ...


MATHEMATICA

Table[3^m3*m, {m, 0, 20}]


PROG

(MAGMA) [3^n3*n: n in [0..30]]; // Vincenzo Librandi, Oct 22 2011
(PARI) a(n)=3^n3*n \\ Charles R Greathouse IV, Sep 08 2012


CROSSREFS

Cf. A107584, A107585.
Sequence in context: A027333 A026576 A048899 * A157535 A098522 A174764
Adjacent sequences: A107580 A107581 A107582 * A107584 A107585 A107586


KEYWORD

nonn,easy


AUTHOR

Zak Seidov, May 16 2005


EXTENSIONS

Corrected by Charles R Greathouse IV, Sep 08 2012


STATUS

approved



