login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089339 Number of primes beginning with n and of the form n concatenated with p where p takes all the prime values less than n. 1
0, 0, 0, 1, 1, 0, 1, 1, 1, 2, 1, 1, 1, 0, 2, 3, 1, 1, 3, 2, 2, 3, 2, 3, 1, 2, 4, 2, 2, 4, 3, 2, 6, 2, 4, 5, 2, 2, 7, 2, 2, 6, 2, 3, 5, 4, 2, 4, 4, 3, 3, 3, 2, 8, 3, 5, 6, 3, 3, 7, 5, 4, 9, 2, 4, 5, 5, 4, 6, 3, 2, 9, 2, 4, 10, 2, 6, 8, 3, 4, 8, 7, 4, 8, 6, 5, 11, 7, 4, 8, 3, 2, 8, 9, 3, 10, 4, 7, 7, 4, 4, 11, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

Conjecture: There are finitely many zeros in this sequence. What is the largest value of n such that a(n) = 0? Perhaps n = 14.

LINKS

Table of n, a(n) for n=1..103.

EXAMPLE

a(10) = 2 and 103 and 107 are the associated primes.

CROSSREFS

Cf. A089340.

Sequence in context: A200650 A281743 A118404 * A249303 A319081 A182662

Adjacent sequences:  A089336 A089337 A089338 * A089340 A089341 A089342

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 04 2003

EXTENSIONS

Corrected and extended by Ray Chandler, Nov 07 2003

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 December 9 00:32 EST 2019. Contains 329871 sequences. (Running on oeis4.)