A145174 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

0, 1, 3, 1, 5, 4, 44, 13, 31, 173, 25, 19, 75, 99, 47, 77, 166, 468, 43, 1, 344, 7, 44, 398, 434, 901, 246, 246, 91, 755, 1066, 839, 1605, 560, 460, 1649, 426, 1203, 732, 1055, 130, 1821, 1645, 360, 4779, 2414, 272, 668, 2410, 3957, 2514, 685, 3484, 3139, 5680

Offset

1,3

Links

Pierre CAMI, Table of n, a(n) for n = 1..200

Example

2*3*(2*3-1)-1=29 prime as 31 so a(2)=1

Crossrefs

Cf. A144946, A144947, A145173

Sequence in context: A007085 A094648 A096975 * A372283 A351965 A228785

Adjacent sequences: A145171 A145172 A145173 * A145175 A145176 A145177

Keyword

nonn

Author

Pierre CAMI, Oct 03 2008

Extensions

Corrected and extended by Ray Chandler, Jan 12 2009

Status

approved