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# Base-dependent classifications of prime numbers

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Classifications of primes depending on their base representation.

## Table of base dependent classifications of prime numbers

Note that under the banner of reversible primes fall both the emirps and the palindromic primes (which in turn also includes the repunit primes).

For the sake of brevity, and to avoid redundancy, 1-digit primes (in the base at hand) have been omitted from this table. And for the sake of convenience, these are all written here in base 10 (which is the usual procedure throughout the OEIS).

Classifications of primes depending on their base representation
Binary
(Base 2)
Quinary
(Base 5)
Octal
(Base 8)
Decimal
(Base 10)
Duodecimal
(Base 12)
(Base 16)
Vigesimal
(Base 20)
Sexatrigesimal
(Base 36)
Absolute primes A000668 (trivially)[1] {11, 13, 17, 19, 23, 31, ...} {13, 29, 31, 41, 43, 47, 59, 61, 73, ...} A003459 {13, 17, 61, 67, 71, 89, 137, 157, 163, 167, 229, 277, ...} {17, 23, 31, 53, 59, 61, 83, 89, ...} {23, 29, 61, 71, 73, 79, ...} {37, 41, 47, 53, 59, 67, 181, 191, 197, ...}
Emirps A080790 {7, 11, 13, 17, 19, 23, 29, 37, 47, ...} {13, 29, 31, 41, 43, 47, 59, 61, 67, 71, 79, ...} A006567 {17, 61, 67, 71, 89, 137, 151, 163, ...} {23, 31, 53, 59, 61, 83, 89, ...} {23, 29, 61, 71, 73, 79, ...} {41, 47, 53, 59, 67, ...}
Palindromic primes A016041 A029973 A029976 A002385 A029979 A029732 {401, 421, 461, ...} {37, 1297, 1549, 1621, 1657, 1693, ...}
Pandigital primes A138837[2] A175277 A175271 A050288 A175272 A175273 A175274 Numbers too large to fit in this cell[3]
Repunit primes A000668 {31, 19531, ...} {73, ...} Indexed by A004023 {13, 157, 22621, ...} {17, ... {421, 10778947368421, ...} {37, ...}
Reversible primes A074832 A075235 A075238 A007500 {13, 17, 61, 67, 71, 89, 137, ...} {17, 23, 31, 53, 59, 61, 83, 89, ...} {23, 29, 61, 71, 73, 79, ...} {23, 29, 31, 37, 41, 47, 53, 59, 67, 181, ...}
Smarandache-Wellin primes {2, 11, 751, ...} {2, 13, ...} {2, 19, 157, ...} A069151 {2, 6835837, ...} {2, 144763, ...} {2, 43, P78,[4] ...} {2, 97387, ...}