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 A104387 Larger of two successive primes the average of which is a repdigit. 3
 5, 7, 11, 101, 113, 4447, 111111113, 555555555559, 10000000000000061, 111111111111111131, 444444444444444469, 555555555555555555619, 777777777777777777777787, 333333333333333333333333333333373 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Lesser primes A104388, repdigits A104389. What is the next term? The next term is 444444444444444444444444444444444497.  The first term with more than 100 digits is a(22) which has 109 digits. - Harvey P. Dale, Jun 28 2011 LINKS FORMULA a(n)=p[A104386(n)+1] MATHEMATICA Union[Flatten[Table[NextPrime/@Select[FromDigits/@Table[PadLeft[{i}, n, i], {n, 45}], Mean[{NextPrime[#], NextPrime[#, -1]}]==#&], {i, 9}]]] (* Harvey P. Dale, Jun 28 2011 *) CROSSREFS Cf. A054268, A104386, A104388, A104389. Sequence in context: A027728 A218275 A086140 * A133761 A057659 A098040 Adjacent sequences:  A104384 A104385 A104386 * A104388 A104389 A104390 KEYWORD nonn,base AUTHOR Zak Seidov, Mar 04 2005 EXTENSIONS More terms from Giovanni Resta, Apr 05 2006 STATUS approved

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Last modified August 9 13:57 EDT 2020. Contains 336323 sequences. (Running on oeis4.)