login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A095192 Smallest semiprime with same leading digits as n!. 0
10, 21, 62, 247, 1202, 7201, 50401, 403201, 3628801, 36288001, 399168002, 4790016001, 62270208001, 871782912007, 130767436800017, 209227898880001, 3556874280960001, 64023737057280001, 12164510040883200031 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
ssp[n_]:=Module[{f=n!, k=0}, While[PrimeOmega[10^Max[IntegerLength[k], 1] f+k]!=2, k++]; 10^Max[1, IntegerLength[k]] f+k]; Array[ssp, 20] (* Harvey P. Dale, May 05 2019 *)
CROSSREFS
Sequence in context: A156592 A045973 A095679 * A356761 A096564 A041196
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jun 21 2004
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)