This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A319081 Number of primes of the form k^3 + n^2 for 0 <= k <= n. 0
 0, 1, 1, 1, 2, 1, 1, 1, 0, 2, 4, 1, 2, 1, 3, 2, 4, 3, 3, 4, 3, 2, 2, 3, 5, 3, 4, 0, 3, 3, 2, 3, 7, 7, 1, 4, 4, 3, 2, 4, 9, 3, 5, 5, 3, 4, 7, 5, 5, 6, 4, 6, 4, 4, 11, 5, 5, 4, 6, 8, 6, 8, 4, 7, 0, 8, 8, 10, 7, 4, 3, 3, 12, 6, 13, 9, 3, 5, 5, 9, 11, 12, 7, 3, 8, 3, 8, 12, 11, 8, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS FORMULA a(n) = 0 if n is a cube other than 1. PROG (PARI) for(n=0, 90, a=sum(k=0, n, isprime(k^3+n^2)); print1(a", ")) CROSSREFS Cf. A066649. Sequence in context: A118404 A089339 A249303 * A182662 A308778 A127284 Adjacent sequences:  A319078 A319079 A319080 * A319082 A319083 A319084 KEYWORD nonn AUTHOR Gionata Neri, Sep 09 2018 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 December 7 00:36 EST 2019. Contains 329812 sequences. (Running on oeis4.)