A144947 Least a(n) such that p(n)#*(p(n)#+a(n))-1 and p(n)#*(p(n)#+a(n))+1 are twin primes with p(i)#=i-th primorial

1, 1, 4, 13, 16, 1, 43, 37, 126, 12, 226, 149, 97, 115, 33, 51, 9, 428, 68, 29, 34, 47, 583, 15, 502, 410, 336, 283, 756, 1303, 33, 793, 343, 703, 1024, 1888, 728, 782, 226, 493, 1977, 3265, 567, 151, 1096, 203, 77, 3255, 381, 4963

Offset

1,3

Links

Pierre CAMI, Table of n, a(n) for n = 1..200 [Corrected Oct 16 2008]

Example

2*(2+1)-1=5 prime as 7 so a(1)=1 6*(6+1)-1=41 prime as 43 so a(2)=1

Crossrefs

Cf. A144946

Sequence in context: A089733 A126908 A106681 * A022416 A027757 A287361

Adjacent sequences: A144944 A144945 A144946 * A144948 A144949 A144950

Keyword

nonn

Author

Pierre CAMI, Sep 26 2008

Status

approved