A129193 Least K such that J*p(n+1)#-K*p(n)#-1 and J*p(n+1)#-K*p(n)#+1 are twin primes for least J>0, K>0 and K<p(n+1), with p(n)=n-th prime and p(n)#=product of the first n primes = primorial(n).

1, 2, 1, 2, 2, 3, 2, 12, 2, 15, 15, 18, 12, 23, 16, 31, 25, 56, 42, 9, 37, 8, 6, 6, 29, 23, 59, 62, 26, 125, 119, 71, 109, 111, 97, 97, 9, 59, 41, 103, 8, 152, 34, 184, 14, 145, 214, 21, 56, 95, 30, 43, 87, 216, 194, 148, 111, 19, 245, 279, 123, 103, 26, 31, 70, 126, 8, 103

Offset

1,2

Comments

Least J values are given in A129192

Links

Table of n, a(n) for n=1..68.

Example

2*3*5-2*3-1=23 prime but 2*3*5-2*3+1=25 composite
2*3*5-2*2*3-1=17 prime twin of 2*3*5-2*2*3+1=19 so K(2)=2 and J(2)=1

Crossrefs

Cf. A129192.

Sequence in context: A202090 A241760 A224493 * A262446 A205147 A319447

Adjacent sequences: A129190 A129191 A129192 * A129194 A129195 A129196

Keyword

nonn

Author

Pierre CAMI, Apr 02 2007

Status

approved