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 A161671 a(n) = prime(n) - A141468(n). 7
 2, 2, 1, 1, 3, 4, 7, 7, 9, 14, 15, 19, 21, 22, 25, 29, 34, 35, 40, 43, 43, 47, 50, 55, 62, 65, 65, 68, 69, 71, 83, 86, 91, 91, 100, 101, 106, 111, 113, 118, 123, 124, 133, 133, 135, 136, 147, 158, 161, 161, 164, 169, 169, 177, 182, 187, 192, 193, 197, 200, 201, 209 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..10000 Michael De Vlieger, Scatterplot of a(n), n = 1..120, showing and labeling primes p (in A214627) in red and blue, the red primes are duplicated and are listed in A220220. We plot in green duplicated composite terms. FORMULA a(n) = A000040(n) - A141468(n). a(n+2) = A168563(n). a(n) = A000040(n) - A018252(n-1), if n >= 2. - Omar E. Pol, Oct 21 2011 a(n) ~ n log n. - Charles R Greathouse IV, Dec 21 2011 EXAMPLE 2(=2-0), 2(=3-1), 1(=5-4), 1(=7-6), 3(=11-8), 4(=13-9), 7(=17-10), 7(=19-12), 9(=23-14), 14(=29-15), etc. MAPLE A161671 := proc(n) ithprime(n)-A141468(n) ; end proc: # R. J. Mathar, Aug 08 2012 MATHEMATICA f[n_] := FixedPoint[n + PrimePi@ # &, n + PrimePi@ n]; Array[Prime[#] - f[# - 1] &, 62] (* Michael De Vlieger, Mar 22 2022, after Robert G. Wilson v at A141468 *) CROSSREFS Cf. A000040, A002808, A141468, A141559, A168563, A214627, A220220. Sequence in context: A237597 A034928 A280267 * A144444 A054106 A132044 Adjacent sequences: A161668 A161669 A161670 * A161672 A161673 A161674 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Jun 16 2009, Dec 03 2009. EXTENSIONS Edited by N. J. A. Sloane, Jun 30 2009 207 replaced with 209 by R. J. Mathar, Oct 04 2009 Edited by Omar E. Pol, Oct 21 2011 STATUS approved

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Last modified February 24 15:13 EST 2024. Contains 370305 sequences. (Running on oeis4.)