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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119986 Least positive k such that k * 10^n + prime(n) is prime. 0
1, 6, 19, 5, 6, 17, 6, 6, 10, 2, 15, 17, 3, 9, 7, 48, 32, 12, 39, 9, 17, 18, 27, 1, 50, 36, 18, 3, 11, 44, 19, 45, 46, 78, 36, 36, 5, 20, 33, 41, 127, 42, 12, 63, 16, 33, 31, 42, 8, 6, 98, 57, 21, 47, 22, 91, 21, 45, 24, 1, 3, 12, 72, 57, 51, 129, 351, 8, 23, 87, 88, 108, 80, 120, 4, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

REFERENCES

J. Earls & J. Rogers, 0.1361015212836455566..., Lulu Press, NY, 2006, p. 22.

LINKS

Table of n, a(n) for n=4..79.

Amazon.com, 0.1361015212836455566...(Title of split novel)

MATHEMATICA

lpk[n_]:=Module[{k=1, c=10^n, p=Prime[n]}, While[!PrimeQ[k*c+p], k++]; k]; Array[ lpk, 80, 4] (* Harvey P. Dale, Sep 01 2020 *)

CROSSREFS

Sequence in context: A214592 A130437 A119813 * A245869 A184197 A173568

Adjacent sequences: A119983 A119984 A119985 * A119987 A119988 A119989

KEYWORD

easy,nonn

AUTHOR

Jason Earls, Aug 03 2006

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 December 5 11:50 EST 2022. Contains 358586 sequences. (Running on oeis4.)