Status of search for primes k.2ⁿ+1

801 < k < 899 & 500,000 < n < 1,000,000

Recently reserved ranges | Reserve or submit a range

Color legend:

completed (X)

being tested

available

k \ n x 1000

500-520

520-540

540-560

560-580

580-600

600-620

620-640

640-660

660-680

680-700

700-720

720-740

740-760

760-780

780-800

800-820

820-840

840-860

860-880

880-900

900-920

920-940

940-960

960-980

980-1000

801

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

803

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

805

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

807

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

809

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

811

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

813

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

815

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

817

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

819

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

821

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

823

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

825

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

827

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

829

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

831

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

833

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

835

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

837

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

839

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

841

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

843

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

845

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

847

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

849

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

851

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

853

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

855

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

857

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

859

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

X

861

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

863

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

865

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

867

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

869

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

re

871

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

873

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

875

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

877

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

879

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

md

881

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

883

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

885

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

887

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

889

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

891

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

893

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

895

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

897

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid

899

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

grid

grid

grid

grid

grid