OFFSET
1,1
COMMENTS
FORMULA
a(n) = A192991(n) - 1.
EXAMPLE
239 is in the sequence because 239+1 = 240 = 6th semiprime * 2^4 = 3 * 5 * 16.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jonathan Vos Post, Jul 13 2011
STATUS
approved