These compressed text files present data on all base-2 Fermat pseudoprimes below below 2⁶⁴.

1. psps-below-2-to-64.txt.bz2 (884 Mbytes, uncompresses to 2.35 Gbytes) lists the pseudoprimes. The first 10 lines read:

   341
   561
   645
   1105
   1387
   1729
   1905
   2047
   2465
   2701
   

2. factored-psps-below-2-to-64.txt.bz2 (1.04 Gbytes, uncompresses to 2.85 Gbytes) lists the prime factorization of each pseudoprime. The first 10 lines read:

   11 31
   3 11 17
   3 5 43
   5 13 17
   19 73
   7 13 19
   3 5 127
   23 89
   5 17 29
   37 73
   

3. annotated-psps-below-2-to-64.txt.bz2 (1.98 Gbytes, uncompresses to 5.56 Gbytes) lists both the pseudoprimes and their prime factorizations, with additional annotations:
   • Column 1: "C" if the pseudoprime is a Carmichael number, blank otherwise.
   • Column 2: "S" if the pseudoprime is a strong pseudoprime, blank otherwise.
   The first 10 lines read:

      341 11 31
   C  561 3 11 17
      645 3 5 43
   C  1105 5 13 17
      1387 19 73
   C  1729 7 13 19
      1905 3 5 127
    S 2047 23 89
   C  2465 5 17 29
      2701 37 73