|
| |
|
|
A175733
|
|
a(n) = the smallest n-digit number with 3 divisors.
|
|
6
|
|
|
|
4, 25, 121, 1369, 10201, 100489, 1018081, 10004569, 100140049, 1000267129, 10000600009, 100008370081, 1000006000009, 10000033772089, 100000380000361, 1000000025191729, 10000001400000049, 100000000621806289, 1000000014000000049, 10000000055856073561
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..20.
|
|
|
FORMULA
|
a(n) = A131581(n-1)^2.
|
|
|
MATHEMATICA
|
Table[Prime[1 + PrimePi[Sqrt[10^n]]]^2, {n, 0, 25}] (* T. D. Noe, Aug 19 2011 *)
|
|
|
CROSSREFS
|
Cf. A131581, A132153, A136582, A175734.
Sequence in context: A069639 A013582 A260373 * A240479 A317949 A263440
Adjacent sequences: A175730 A175731 A175732 * A175734 A175735 A175736
|
|
|
KEYWORD
|
nonn,base
|
|
|
AUTHOR
|
Jaroslav Krizek, Aug 24 2010
|
|
|
STATUS
|
approved
|
| |
|
|
