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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A155213 a(n) = floor(prime(n)/9). 1 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 11, 11, 12, 12, 14, 14, 15, 15, 16, 16, 17, 18, 18, 19, 19, 20, 21, 21, 21, 22, 23, 24, 25, 25, 25, 26, 26, 27, 28, 29, 29, 30, 30, 31, 31, 32, 34, 34, 34, 35, 36, 37, 38, 38, 39, 39, 40, 41, 42, 42, 43, 44, 44, 45 (list; graph; refs; listen; history; text; internal format) OFFSET 1,8 COMMENTS 13, 33, 52, 59, 69, 86, 96, 99, 106 etc. are not in the sequence. LINKS Table of n, a(n) for n=1..80. FORMULA a(n) = (A000040(n) - A038194(n))/9 . PROG (PARI) a(n) = prime(n)\9; \\ Michel Marcus, Sep 25 2015 CROSSREFS Cf. A000040, A038194. Sequence in context: A120397 A104305 A050506 * A029122 A134482 A132921 Adjacent sequences: A155210 A155211 A155212 * A155214 A155215 A155216 KEYWORD nonn,easy AUTHOR Paul Curtz, Jan 22 2009 EXTENSIONS Edited and extended by R. J. Mathar, Feb 27 2009 STATUS approved

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Last modified August 18 11:30 EDT 2024. Contains 375266 sequences. (Running on oeis4.)