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	2,158
Gen Riesel primes k•bn-1	base	4
Proth primes k•2n+1	k-value	58
Gen Proth primes k•bn+1	base	5
Carol-Kynea primes (bn±1)2-2	base	381
Williams primes (b-1)•bn-1	base	169
Williams primes (b-1)•bn+1	base	153
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
Gen Woodall primes n•bn-1	base	17
Near Gen Woodall primes (n-1)•bn-1	base	3
Near Gen Woodall primes (n+1)•bn-1	base	2
Gen Cullen primes n•bn+1	base	30
Near Gen Cullen primes (n-1)•bn+1	base	1
Near Gen Cullen primes (n+1)•bn+1	base	1

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

Prime numbers

Mersenne Proth Riesel Williams (b±1)bn±1 Carol/Kynea (bn±1)2-2 Multifactorial n!j±1