|
|
A048535
|
|
a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 3's.
|
|
10
|
|
|
5, 36, 182, 1817, 4830, 5773, 153079, 577355, 3659694, 18366636, 182574188, 576484036, 1839384036, 17701331569, 36542213005, 485935528988, 1814754484036, 5755287250288, 5773506159694, 182738579159694, 230940107675430, 1820173984357898, 18202838331788627, 57475066797119386, 182305878493709942
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
a(2) = 36 since A002378(36) = 1332;
a(3) = 182 since A002378(182) = 33306;
a(4) = 1817 since A002378(1817) = 3303306, etc.
(End)
|
|
MATHEMATICA
|
With[{s = 2 Accumulate[Range[0, 10^6]]}, Table[-1 + FirstPosition[s, _?(DigitCount[#, 10, 3] == n &)][[1]], {n, 8}]] (* Michael De Vlieger, Oct 05 2019 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|