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!)
 A175247 Primes (A000040) with noncomposite (A008578) subscripts. 2
 2, 3, 5, 11, 17, 31, 41, 59, 67, 83, 109, 127, 157, 179, 191, 211, 241, 277, 283, 331, 353, 367, 401, 431, 461, 509, 547, 563, 587, 599, 617, 709, 739, 773, 797, 859, 877, 919, 967, 991, 1031, 1063, 1087, 1153, 1171, 1201, 1217, 1297, 1409, 1433, 1447 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A006450 is the main entry for these numbers. [Arkadiusz Wesolowski, Mar 12 2011] LINKS FORMULA a(n) U A007821(n+1) = A000040(n) for n >= 1. a(n) = prime(noncomposite(n)) = A000040(A008578(n)). a(1) = 2, a(n) = A006450(n-1) for n >= 2. EXAMPLE a(5) = 17 because a(5) = p(q(5)) = p(7) = 17, p = prime, q = noncomposite. CROSSREFS Cf. A006450, A000040. Sequence in context: A055498 A073021 A258185 * A298598 A079370 A014210 Adjacent sequences:  A175244 A175245 A175246 * A175248 A175249 A175250 KEYWORD nonn AUTHOR Jaroslav Krizek, Mar 13 2010 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 April 16 07:59 EDT 2021. Contains 343030 sequences. (Running on oeis4.)