OFFSET
1,1
COMMENTS
a(45) = 8303765624.
Conjecture: no term is -1.
EXAMPLE
a(1) = 8 = 2*2+2+2.
a(2) = 23 = 5*3+5+3 = 7*2+7+2.
a(3) = 35 = 11*2+11+2 = 8*3+8+3 = 5*5+5+5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Jan 24 2015
STATUS
approved