A157520 Table T(n,2) read by row with T(n,2)=least j<k, T(n,1)=k such that sum j+k is the least such that 6*p(k)*p(j)^n -1 and +1 are twin primes with p(i)=i-th prime.

3, 1, 2, 1, 3, 1, 1, 1, 5, 1, 2, 1, 8, 1, 4, 3, 3, 1, 9, 4, 9, 5, 9, 4, 5, 2, 6, 2, 12, 5, 1, 1, 13, 4, 9, 1, 12, 3, 31, 1, 3, 2, 6, 3, 63, 3, 27, 4, 13, 2, 44, 9, 41, 6, 78, 3, 25, 3, 35, 3, 47, 1, 37, 8, 24, 1, 40, 3, 20, 1, 73, 1, 107, 26, 39, 2, 24, 1, 119, 27, 73, 47, 2, 1, 14, 5, 31, 5, 64, 7

Offset

1,1

Links

Table of n, a(n) for n=1..90.

Example

p(3)=5,p(1)=2, 6*5*2^1-1=59 is prime, so is 61, so T(1,1)=3 T(1,2)=1.
p(2)=3,p(1)=2, 6*3*2^2-1=71 is prime, so is 73, so T(2,1)=2 T(2,2)=1.
p(3)=5,p(1)=2, 6*5*2^3-1=239 is prime, so is 241, so T(3,1)=3 T(3,2)=1.

Crossrefs

Sequence in context: A256262 A332929 A361019 * A325116 A227339 A030777

Adjacent sequences: A157517 A157518 A157519 * A157521 A157522 A157523

Keyword

nonn,tabf

Author

Pierre CAMI, Mar 02 2009

Status

approved