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!)
A104386 Numbers n such that average of n-th and (n+1)-th primes is a repdigit. 3
2, 3, 4, 25, 29, 603, 6363181, 21366409911 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding primes A104387, A104388, repdigits A104389. What is the next term?

LINKS

Table of n, a(n) for n=1..8.

FORMULA

(p[n]+p[n+1])/2 = repdigit

CROSSREFS

Cf. A054268, A104387 - A104389.

Sequence in context: A055006 A139050 A043309 * A171558 A044906 A255312

Adjacent sequences:  A104383 A104384 A104385 * A104387 A104388 A104389

KEYWORD

more,nonn,base

AUTHOR

Zak Seidov, Mar 04 2005

EXTENSIONS

One more term from Giovanni Resta, Apr 05 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 14 09:14 EDT 2020. Contains 336480 sequences. (Running on oeis4.)