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!)
 A145203 a(n) = Primepi(A002407(n)). 1
 4, 8, 12, 18, 31, 58, 67, 78, 101, 115, 157, 260, 279, 297, 337, 361, 406, 449, 500, 578, 604, 688, 716, 808, 907, 937, 1037, 1146, 1259, 1407, 1447, 1577, 1614, 1926, 2204, 2253, 2511, 2613, 2725, 2772, 2882, 2992, 3576, 3762, 4480 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 PROG (PARI) j=[]; for(n=1, 300, if(isprime(n^3-(n-1)^3), j=concat(j, primepi(n^3-(n-1)^3)))); j (Python) from sympy import isprime, primepi A145203_list = [primepi(3*n*(n+1)+1) for n in range(10**3) if isprime(3*n*(n+1)+1)] # Chai Wah Wu, Jun 02 2017 CROSSREFS Cf. A002407. Sequence in context: A111201 A311642 A311643 * A311644 A311645 A311646 Adjacent sequences:  A145200 A145201 A145202 * A145204 A145205 A145206 KEYWORD nonn AUTHOR Alexander R. Povolotsky, Oct 04 2008 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 April 8 01:40 EDT 2020. Contains 333312 sequences. (Running on oeis4.)