OFFSET

1,1

COMMENTS

LINKS

Chris Caldwell, The Prime Glossary, Cunningham chains.

EXAMPLE

a(1)=2 is here because 2 -> 3 -> 5 through <2p-1> and the chain ends here (with this operator).

a(2)=19 is here because 19 -> 37 -> 73 through <2p-1>.

a(3)=41 is here because 41 -> 83 -> 167 through <2p+1>.

- 11 is not here because it is well followed by two terms, but doesn't start this sequence (2->5->11->23->47).

- 89 is not here because it starts a 6 terms chain.

CROSSREFS

KEYWORD

nonn

AUTHOR

Alexandre Wajnberg, Aug 31 2005

EXTENSIONS

Terms computed by Gilles Sadowski.

STATUS

approved