A139699 Positive integers x,y such that prime(x)*prime(x+y) = y^2 + 1, ordered by increasing x+y.

1, 5, 3, 22, 10, 186

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Sebastian Martin Ruiz, Home Page

Example

prime(1)*prime(1+5) = 2*13 = 26 = 5^2+1.

Crossrefs

Sequence in context: A296356 A154825 A091593 * A303634 A069607 A128366

Adjacent sequences: A139696 A139697 A139698 * A139700 A139701 A139702

Keyword

nonn,tabf,more

Author

Sebastian Martin-Ruiz (s_m_ruiz(AT)yahoo.es), Aug 25 2008

Status

approved