The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A340205 Number of primes in A339443 among the values of A339443(k) for k = 1..n. 1
 0, 0, 1, 1, 2, 2, 3, 4, 4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 10, 10, 11, 12, 12, 13, 14, 14, 14, 15, 16, 17, 17, 17, 17, 17, 18, 19, 19, 20, 21, 21, 21, 21, 21, 22, 23, 24, 24, 24, 25, 26, 26, 26, 26, 27, 27, 28, 29, 29, 29, 30, 31, 31, 31, 32, 32, 33, 33, 33, 34, 35, 35, 35, 35, 35 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS FORMULA a(n) = Sum_{k=1..n} pi(c(k)) - pi(c(k)-1), where c = A339443. EXAMPLE a(12) = 6; The first 12 values of A339443 are 1, 1, 2, 1, 3, 1, 2, 2, 4, 1, 3, 2 (of which, 6 are prime). CROSSREFS Cf. A000720, A339443, A340203. Sequence in context: A218446 A102548 A343174 * A004001 A086841 A076502 Adjacent sequences:  A340202 A340203 A340204 * A340206 A340207 A340208 KEYWORD nonn AUTHOR Wesley Ivan Hurt, Dec 31 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 25 02:16 EDT 2021. Contains 347651 sequences. (Running on oeis4.)