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# PW:Statistics

## Countings: Sequences per type

Sequences (per base, k-value or individual number) with own page in this Wiki:

Sequence Type counting
Mersenne primes number 51
Riesel primes k•2n-1 k-value 3,846
Riesel primes kbn-1, b>2 base 13
Proth primes k•2n+1 k-value 188
Proth primes kbn+1, b>2 base 10
Carol-Kynea primes (bn±1)2-2 base 382
Williams primes (b-1)bn-1 base 169
Williams primes (b-1)bn+1 base 154
Williams primes (b+1)bn-1 base 87
Williams primes (b+1)bn+1 base 82
Leyland numbers xy+yx number 1,814
Leyland numbers xy-yx number 1
Woodall primes nbn-1 base 775
Near Woodall primes (n-1)bn-1 base 4
Near Woodall primes (n+1)bn-1 base 3
Cullen primes nbn+1 base 139
Near Cullen primes (n-1)bn+1 base 1
Near Cullen primes (n+1)bn+1 base 1
Fermat numbers F(2) number 152
GF Divisors (2) number 189
Gen.Fermat numbers xGF(3) number 22
GF Divisors (3) number 207
Gen.Fermat numbers xGF(4) number 5
GF Divisors (4) number 65
Gen.Fermat numbers xGF(5) number 26
GF Divisors (5) number 392
Gen.Fermat numbers xGF(6) number 15
GF Divisors (6) number 159
Gen.Fermat numbers xGF(7) number 38
GF Divisors (7) number 487
Gen.Fermat numbers xGF(8) number 29
GF Divisors (8) number 393
Gen.Fermat numbers xGF(9) number 25
GF Divisors (9) number 377
Gen.Fermat numbers xGF(10) number 27
GF Divisors (10) number 306
Gen.Fermat numbers xGF(11) number 69
GF Divisors (11) number 822
Gen.Fermat numbers xGF(12) number 26
GF Divisors (12) number 343
all GF Divisors number 1426
Gen.Repunit bases 2
Number classes
 General numbers
 Special numbers Mersenne 2n-1 Fermat 22n+1 Proth k•2n+1 Riesel k•2n-1 Woodall n•2n-1 Cullen n•2n+1 Double Mersenne 22p-1-1 Perfect 2n-1(2n-1) Leyland xy ± yx Gen.Repunit (b^n-1)/(b-1)
 Prime numbers Mersenne Proth Riesel Williams (b±1)bn±1 Carol/Kynea (bn±1)2-2 Multifactorial n!j±1