A321323 Numbers k such that k^(2^20) + 1 is prime (a generalized Fermat prime).

1, 919444, 1059094, 1951734, 1963736, 3843236

Offset: 1

Author

Jeppe Stig Nielsen, Nov 04 2018

Keywords

• nonn
• hard
• more

Links

• Chris K. Caldwell, The Prime Database: 919444^1048576 + 1
• Chris K. Caldwell, The Prime Database: 1059094^1048576 + 1
• Chris K. Caldwell, The Prime Database: ?^1048576 + 1

Crossrefs

Cf. A056993, A005574, A000068, A006314, A006313, A006315, A006316, A056994, A056995, A057465, A057002, A088361, A088362, A226528, A226529, A226530, A251597, A253854, A244150, A243959.

Extensions

a(4) from Jeppe Stig Nielsen, Aug 31 2022

a(5) from Jeppe Stig Nielsen, Oct 21 2022

a(6) from Jeppe Stig Nielsen, Jan 11 2025