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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: A156324 A082645 A111201 * A045750 A187571 A287402

Adjacent sequences:  A145200 A145201 A145202 * A145204 A145205 A145206

KEYWORD

nonn

AUTHOR

Alexander R. Povolotsky, Oct 04 2008

STATUS

approved

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Last modified August 23 13:52 EDT 2017. Contains 291004 sequences.