A169984 Primes in carryless arithmetic mod 10 in which all digits except the rightmost are zero or five.

51, 52, 53, 54, 56, 57, 58, 59, 551, 553, 557, 559, 5051, 5053, 5057, 5059, 5501, 5503, 5507, 5509, 50051, 50053, 50057, 50059, 55001, 55003, 55007, 55009, 55551, 55553, 55557, 55559, 500501, 500503, 500507, 500509, 505001, 505003

Offset: 1

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Aug 24 2010

Keywords

• nonn
• base

Comments

These are called f-type primes.

Links

• Index entries for sequences related to carryless arithmetic

Crossrefs

A169887 = A163396 union A169984.