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!)
A093943 Primes of the form 8*10^n + 7*R_n, where R_n is the repunit (A002275) of length n. 1
877, 8777777777, 8777777777777777, 877777777777777777777777777777777, 877777777777777777777777777777777777777, 877777777777777777777777777777777777777777777777777777777777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

Makoto Kamada, Prime numbers of the form 877...77.

Index entries for primes involving repunits

CROSSREFS

Cf. A002275, A056724 (corresponding n).

Sequence in context: A208787 A208587 A208472 * A252437 A129313 A063051

Adjacent sequences:  A093940 A093941 A093942 * A093944 A093945 A093946

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 17 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 04:56 EDT 2021. Contains 345056 sequences. (Running on oeis4.)