A242555 Least number k such that k^32 + n^32 is prime.

1, 29, 40, 33, 34, 131, 50, 9, 8, 11, 10, 13, 12, 97, 166, 221, 200, 13, 10, 61, 176, 23, 22, 65, 94, 151, 352, 87, 2, 1, 38, 39, 4, 5, 48, 137, 18, 11, 4, 3, 60, 55, 40, 9, 106, 33, 10, 29, 134, 7, 44, 33, 50, 1, 38, 5, 148, 37, 2, 41, 10, 11, 94, 75, 4, 5, 100, 5, 22

Offset

1,2

Comments

If a(n) = 1, then n is in A006315.

Links

Table of n, a(n) for n=1..69.

Mathematica

lnk[n_]:=Module[{k=1, n32=n^32}, While[!PrimeQ[n32+k^32], k++]; k]; Array[ lnk, 70] (* Harvey P. Dale, Apr 26 2018 *)

Prog

(Python)
import sympy
from sympy import isprime
def a(n):
  for k in range(10**4):
    if isprime(n**32+k**32):
      return k
n = 1
while n < 100:
  print(a(n))
  n += 1
(PARI) a(n)=for(k=1, oo, if(ispseudoprime(n^32+k^32), return(k)));

Crossrefs

Cf. A069003, A006315.

Sequence in context: A159887 A159888 A108325 * A101007 A253252 A155575

Adjacent sequences: A242552 A242553 A242554 * A242556 A242557 A242558

Keyword

nonn

Author

Derek Orr, May 17 2014

Status

approved