A112550 Define a(1)=41; then a(n)=k*a(n-1)^2-1 with k least number such that a(n) and a(n)+2 are twin primes.

41, 282407, 99054112352057, 29847243642863658530046303259457, 438302112913620818033722039251417607232953642602702120391887945707

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

168*41^2-1=282407, 282407 and 282409 are twin primes so a(2)=282407

Crossrefs

See k sequence in A112551

Sequence in context: A214184 A078813 A214235 * A114927 A286915 A297056

Adjacent sequences: A112547 A112548 A112549 * A112551 A112552 A112553

Keyword

nonn

Author

Pierre CAMI, Sep 13 2005

Status

approved