while loop - Given value p, return last element of sequence < p - Fortran -

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i have sequence of numbers follows:

1 , 1, 5, 13, 41, 121, 365, ....

the first 2 values are:

n(1) = 1 , n(2) = 1

as 3rd value, n(i) = 2*n(i-1) + 3*n(i-2)

the issue facing is: if give argument of p, should return me last values of sequence < p (using fortran77).

for instance, if p = 90, should return value 41. 

a = 1 b = 1 while b < p:     c = 2 * b + 3 *     = b     b = c return

the fortran equivalent is:

function fct(p) result(a)   integer, intent(in) :: p   integer :: a, b, c    = 1   b = 1   while (b < p)       c = 2 * b + 3 *       = b       b = c   enddo end function  program test   integer :: fct   external fct   print *,fct(90) end program

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