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 k•bn-1, b>2	base	13
Proth primes k•2n+1	k-value	176
Proth primes k•bn+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 n•bn-1	base	775
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	152
GF Divisors (2)	number	189
Gen.Fermat numbers xGF(3)	number	21
GF Divisors (3)	number	206
Gen.Fermat numbers xGF(4)	number	5
GF Divisors (4)	number	65
Gen.Fermat numbers xGF(5)	number	23
GF Divisors (5)	number	386
Gen.Fermat numbers xGF(6)	number	14
GF Divisors (6)	number	157
Gen.Fermat numbers xGF(7)	number	37
GF Divisors (7)	number	484
Gen.Fermat numbers xGF(8)	number	28
GF Divisors (8)	number	391
Gen.Fermat numbers xGF(9)	number	25
GF Divisors (9)	number	377
Gen.Fermat numbers xGF(10)	number	26
GF Divisors (10)	number	302
Gen.Fermat numbers xGF(11)	number	69
GF Divisors (11)	number	821
Gen.Fermat numbers xGF(12)	number	25
GF Divisors (12)	number	342
all GF Divisors	number	1406

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