RosettaCodeData/Task/Extensible-prime-generator/PARI-GP/extensible-prime-generator-1.pari

void
showprimes(GEN lower, GEN upper)
{
  forprime_t T;
  if (!forprime_init(&T, a,b)) return;
  while(forprime_next(&T))
  {
    pari_printf("%Ps\n", T.pp);
  }
}