The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A102503 Primes of the concatenated form 9nn9. 3
 910109, 913139, 916169, 917179, 920209, 923239, 928289, 931319, 935359, 937379, 946469, 953539, 956569, 961619, 965659, 968689, 974749, 982829, 994949, 995959, 998989, 9101010109, 9101310139, 9101810189, 9104210429, 9104810489 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 910109 is prime and of the form 9nn9 for n=10. 9101310139 is prime and of the form 9nn9 for n=1013. CROSSREFS Cf. A102484 for sequence of all numbers of form 9nn9. A102502 for the n values corresponding to the primes in this sequence. Sequence in context: A015333 A141461 A035793 * A251908 A186608 A236617 Adjacent sequences:  A102500 A102501 A102502 * A102504 A102505 A102506 KEYWORD easy,nonn,base AUTHOR Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 13 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.

Last modified May 26 13:49 EDT 2020. Contains 334626 sequences. (Running on oeis4.)