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!)
A108833 Primes such that the outer 2 digits are n and n-1 and all inner digits are 5, where 0 < n < 9. 0
251, 857, 2551, 45553, 255551, 2555551, 45555553, 855555557, 2555555555551, 45555555555555555553, 45555555555555555555555555555555553, 4555555555555555555555555555555555555555555555555555553 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

PROG

(PARI) n10np1(n, d) = { local(x, y, k); for(x=1, n, for(k=1, 8, y=10^(x+1)*k+floor(10^x*d/9)*10+k-1; if(isprime(y), print1(y", ")) ) ) }

CROSSREFS

Sequence in context: A001135 A052232 A179231 * A228672 A339182 A008917

Adjacent sequences:  A108830 A108831 A108832 * A108834 A108835 A108836

KEYWORD

easy,nonn,base

AUTHOR

Cino Hilliard, Jul 11 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 April 10 22:25 EDT 2021. Contains 342856 sequences. (Running on oeis4.)