A144111 Number of different pairs of primes p and q with p<q such that 6*r(n)=p+q with r(i)=i-th prime

1, 2, 3, 4, 6, 7, 8, 10, 8, 11, 13, 11, 16, 14, 16, 15, 20, 18, 17, 21, 21, 23, 23, 22, 25, 27, 26, 25, 29, 28, 30, 30, 29, 33, 34, 34, 34, 35, 36, 40, 40, 39, 38, 42, 40, 45, 42, 45, 44, 47, 45, 50, 45, 51, 46, 47, 53, 55, 54, 56, 52, 55, 54, 53, 61, 55, 58, 59, 59, 62, 63, 64

Offset

1,2

Comments

The sequence is infinite

Links

Table of n, a(n) for n=1..72.

Example

6*2=12 5+7=12, 2=r(1) so a(1)=1 6*3=18 5+13=18, 7+11=18, 3=r(2) so a(2)=2 6*5=30 7+23=30, 11+19=30, 13+17=30, 5=r(3) so a(3)=3

Crossrefs

Sequence in context: A209643 A039123 A131618 * A039257 A345914 A039198

Adjacent sequences: A144108 A144109 A144110 * A144112 A144113 A144114

Keyword

nonn

Author

Pierre CAMI, Sep 11 2008

Status

approved