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 A214935 Index of the primes of A205827, A000720(A205827(n)). 9
 1, 2, 4, 9, 30, 189, 217, 2225, 3385, 14357, 30802, 31545, 104071, 149689, 1094421, 1319945, 10655462, 23163298, 112228683, 182837804, 203615628, 486570087, 1094330259, 11992433550, 17883926781, 50070452577, 52302956123, 72178455400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A000040(a(n)) = A205827(n). With pi(x) being the prime counting function, A000720(x), for n from 1 to 3, a(n) = pi(A111870(n)) = A241542(n), for n from 5 to 28, a(n) = pi(A111870(n-1)) = A241542(n-1). - John W. Nicholson, May 10 2014 LINKS John W. Nicholson, Table of n, a(n) for n = 1..38 FORMULA a(n) = pi(A205827(n)) = A000720(A205827(n)). EXAMPLE a(4) = 9, A000040(9) = 23, and A205827(4) = 23. PROG (PARI) record=0; i=0; A214935=vectorsmall(38); for(n=1, 75, current=(A000101[n]/A002386[n]*1.)^A005669[n]; if(current>record, record=current; i++; A214935[i]=A005669[n])) CROSSREFS Cf. A205827. Sequence in context: A208965 A306505 A243789 * A092329 A053548 A054119 Adjacent sequences:  A214932 A214933 A214934 * A214936 A214937 A214938 KEYWORD nonn AUTHOR John W. Nicholson, Oct 28 2012 EXTENSIONS a(13)-a(28) from Donovan Johnson, Oct 28 2012 a(29)-a(38) from John W. Nicholson, Dec 01 2013 STATUS approved

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Last modified August 13 00:27 EDT 2020. Contains 336441 sequences. (Running on oeis4.)