// output of ./demo/mod/eratosthenes-demo.cc:
// Description:
//% Sieve of Eratosthenes.

arg 1: 100 == n  [Upper limit for prime search]  default=100
arg 2: 1 == q  [1 ==> use optimized sieve, else non-optimized.]  default=1
 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Found 25 primes below 100.