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	3,844
Riesel primes k•bn-1, b>2	base	12
Proth primes k•2n+1	k-value	159
Proth primes k•bn+1, b>2	base	9
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 n•bn-1	base	776
Near Woodall primes (n-1)•bn-1	base	4
Near Woodall primes (n+1)•bn-1	base	3
Cullen primes n•bn+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	150
GF Divisors (2)	number	185
Gen.Fermat numbers xGF(3)	number	21
GF Divisors (3)	number	204
Gen.Fermat numbers xGF(4)	number	4
GF Divisors (4)	number	64
Gen.Fermat numbers xGF(5)	number	15
GF Divisors (5)	number	369
Gen.Fermat numbers xGF(6)	number	11
GF Divisors (6)	number	149
Gen.Fermat numbers xGF(7)	number	26
GF Divisors (7)	number	454
Gen.Fermat numbers xGF(8)	number	23
GF Divisors (8)	number	372
Gen.Fermat numbers xGF(9)	number	17
GF Divisors (9)	number	357
Gen.Fermat numbers xGF(10)	number	18
GF Divisors (10)	number	283
Gen.Fermat numbers xGF(11)	number	45
GF Divisors (11)	number	759
Gen.Fermat numbers xGF(12)	number	14
GF Divisors (12)	number	316
all GF Divisors	number	1211

Number classes

General numbers

Integer Natural Even Odd Rational Irrational Real Prime Probable prime

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