A111803 Least k such that (k*p(n)#)^2 + k*p(n)# -1 and (k*p(n)#)^2 + k*p(n)# +1 are twin primes with p(n)# = n-th primorial.

1, 1, 24, 6, 7, 1, 16, 4, 9, 17, 65, 21, 36, 196, 571, 62, 278, 92, 105, 24, 138, 143, 489, 547, 221, 1111, 254, 242, 316, 1287, 195, 789, 758, 627, 756, 226, 547, 583, 154, 533, 2016, 65, 1500, 4377, 835, 814, 61, 1547, 2771, 3177, 898, 191, 3221, 7410, 1361

Offset

1,3

Links

Table of n, a(n) for n=1..55.

Example

(1*2*3)^2+(1*2*3)-1=41
(1*2*3)^2+(1*2*3)+1=43
41 and 43 twin primes so k(2)=1 as p(2)# =2*3

Crossrefs

Sequence in context: A040560 A040558 A215752 * A091737 A097481 A267744

Adjacent sequences: A111800 A111801 A111802 * A111804 A111805 A111806

Keyword

nonn

Author

Pierre CAMI, Aug 17 2005

Status

approved