L(N) denotes the Nth Lucas Number
Find the first three digits of L(2016)
(In reply to re: solution+
I must take your word for it.
The offset (i.e. most of the fractional part of the number missing to make it integer) clearly results from ignoring the e^(-N ) in cosh(N*Phi) exact formula; see the vast number of nines, making it " almost " an integer..