OFFSET
1,1
COMMENTS
Needed factorizations are in the Cunningham Project.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..39
S. S. Wagstaff, Jr., The Cunningham Project.
FORMULA
a(n) = 2^A183072(n) - 1.
EXAMPLE
63 = 2^6 - 1 = 3^2 * 7, and 3 and 7 have the form 4j + 3.
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Stuart Clary, Dec 23 2010
STATUS
approved