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 A105930 Starting position of the n-th prime in the almost-natural numbers sequence A007376. 0
 2, 3, 5, 7, 12, 16, 24, 28, 36, 48, 52, 64, 72, 76, 84, 96, 108, 112, 124, 132, 136, 148, 156, 168, 184, 193, 199, 211, 217, 229, 271, 283, 301, 307, 337, 343, 361, 379, 391, 409, 427, 433, 463, 469, 481, 487, 523, 559, 571, 577, 589, 607, 613, 643, 661, 679 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS Prime number positions in the "counting digits": write the natural numbers as an infinite sequence of digits, starting at the left. a(n) is the subscript (i.e. the position in this sequence of "counting digits") of the first digit of the n-th prime. LINKS EXAMPLE a(6)=16 because the sixth prime (13) appears at the 16th (and 17th) position in the "counting digits": 123456789101112-13-141516 MATHEMATICA f[n_] := Block[{d = Floor[ Log[10, n] + 1]}, d(n - 1) - Sum[9i*10^(d - i - 1), {i, d - 1}] + 1]; Table[ f[ Prime[n]], {n, 56}] (* Robert G. Wilson v, Apr 30 2005 *) CROSSREFS Cf. A007376, A103575. Sequence in context: A113623 A308868 A078912 * A122622 A266775 A024790 Adjacent sequences:  A105927 A105928 A105929 * A105931 A105932 A105933 KEYWORD base,easy,nonn AUTHOR Alexandre Wajnberg, Apr 26 2005 EXTENSIONS Edited by Robert G. Wilson v, Apr 30 2005 STATUS approved

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Last modified January 16 18:17 EST 2022. Contains 350376 sequences. (Running on oeis4.)