The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A088267 Smallest number that on prefixing with the n-th term of A088265 yields prime. 2
 2, 1, 3, 4, 5, 1, 5, 1, 2, 1, 6, 9, 18, 9, 5, 4, 2, 7, 3, 1, 6, 3, 11, 9, 20, 6, 32, 16, 11, 13, 11, 1, 6, 15, 6, 21, 18, 1, 5, 13, 14, 1, 6, 18, 15, 9, 12, 3, 50, 19, 56, 12, 9, 3, 5, 66, 27, 1, 8, 24, 11, 9, 11, 13, 24, 79, 3, 43, 26, 19, 11, 4, 39, 3, 45, 9, 11, 6, 6, 15, 2, 1, 41, 18, 5, 19 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS EXAMPLE a(13) = 18 as A088265(13) = 10001 and 1810001 is a prime while 110001, 210001 to 1710001 are all composite. CROSSREFS Cf. A088265, A088267. Sequence in context: A085985 A331747 A285107 * A286449 A318310 A336925 Adjacent sequences: A088264 A088265 A088266 * A088268 A088269 A088270 KEYWORD base,nonn AUTHOR Amarnath Murthy, Sep 28 2003 EXTENSIONS More terms from David Wasserman, Jul 28 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 29 22:15 EDT 2023. Contains 361599 sequences. (Running on oeis4.)