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 A114784 Smallest prime of the form: all twos followed by prime(n). a(n) > prime(n). 0 if no such prime exists. 4
 0, 23, 0, 227, 211, 2213, 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222217, 2222219, 223, 229, 2222222222222222222222222231, 2237, 241, 2243, 22247 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Prime(n) is all zeros followed by prime(n). This is all twos followed by prime(n). Conjecture: No term is zero except a(1) = a(3) = 0. a(6) has not been proved prime, but it is a probable prime. - Joshua Zucker, May 06 2006 The 206-digit number 222...217 is, in fact, prime, as quickly confirmed by the Magma Calculator (http://magma.maths.usyd.edu.au/calc/). - Jon E. Schoenfield, Aug 24 2009 LINKS EXAMPLE a(6) = 2213, as 213 is composite prime(6) = 13. CROSSREFS Cf. A114783. Sequence in context: A143196 A092993 A238331 * A141517 A040534 A040533 Adjacent sequences:  A114781 A114782 A114783 * A114785 A114786 A114787 KEYWORD base,nonn AUTHOR Amarnath Murthy, Nov 17 2005 EXTENSIONS More terms from Joshua Zucker, May 06 2006 Edited by T. D. Noe, Oct 30 2008 STATUS approved

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Last modified May 25 21:44 EDT 2022. Contains 354071 sequences. (Running on oeis4.)