OFFSET
1,1
COMMENTS
Conjecture: sequence is infinite.
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..1280
EXAMPLE
a(3)=31 because it is prime and 30=2*3*5, 32=2^5 and 2+3+5 = 2+2+2+2+2 = 10.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 28 2003
STATUS
approved