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 A062802 a(1) = 2; a(n+1) = smallest prime > a(n) whose sum of digits is a(n). 3
 2, 11, 29, 2999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(5) = 5*10^333 - 10^332 - 10^174 - 1 = 489999999999999999999999999999999999999999999999999999999999999999999999999\     99999999999999999999999999999999999999999999999999999999999999999999999\     99999999999998999999999999999999999999999999999999999999999999999999999\     99999999999999999999999999999999999999999999999999999999999999999999999\     9999999999999999999999999999999999999999999999 which is too large to include in the DATA field. - Don Reble, Sep 03 2006 Define b(n), n>=0, to be the smallest prime p such that applying the sum-of-digits function n successive times to p produces n distinct primes (excluding p itself). Is b(n) = a(n) for all n? The first four terms agree. - Felix Fröhlich, Aug 13 2015 It is very likely that this is the case, since although there are always larger "parent" primes with the same digital sum, they typically are at least twice as large (for p=2, these are 11, 101, ...; for p=11 these are 29, 47, 83, ...; for p=29 these are 2999, 3989, 4799, ...), and the number of *digits* of the next term is roughly proportional to this value, so even the "second best" choice would typically lead to a much larger "parent" prime. - M. F. Hasler, Aug 16 2015 LINKS MATHEMATICA a = {2}; k = 3; Do[While[Total@ IntegerDigits@ k != a[[n - 1]], k = NextPrime@ k]; AppendTo[a, k], {n, 2, 4}]; a (* Michael De Vlieger, Aug 20 2015 *) CROSSREFS Different from A103830 after a(4). Sequence in context: A285812 A140745 A178629 * A103830 A162260 A023664 Adjacent sequences:  A062799 A062800 A062801 * A062803 A062804 A062805 KEYWORD nonn,base AUTHOR G. L. Honaker, Jr., Jul 19 2001 STATUS approved

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Last modified October 19 03:34 EDT 2019. Contains 328211 sequences. (Running on oeis4.)