login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087700 a(1) = 1, a(n) = smallest number such that the n-th partial concatenation has n divisors. 1
1, 1, 449, 1, 61206166658506517441, 359 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Next term is about 6.4*10^150 and is too large to include. - David Wasserman, Jun 16 2005

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

1,11,11449,114491, etc. have 1, 2, 3 and 4 divisors respectively.

11449= 107^2, 114491 = 13*8807.

CROSSREFS

Sequence in context: A229370 A174154 A071104 * A107666 A020466 A142420

Adjacent sequences:  A087697 A087698 A087699 * A087701 A087702 A087703

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Sep 26 2003

EXTENSIONS

One more term from David Wasserman, Jun 16 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 9 14:41 EDT 2020. Contains 335543 sequences. (Running on oeis4.)