numlib::prevprime
-- next
smaller primeFor an integer a
numlib::prevprime
(a)
returns the greatest
prime number . If a
then
numlib::prevprime
(a)
returns
FAIL
.
numlib::prevprime(a)
numlib::prevprime(symb)
a |
- | an integer |
numlib::prevprime
(a)
returns either a
natural number or FAIL
.
isprime
, ithprime
, nextprime
, numlib::proveprime
numlib::prevprime
returns the function call with
evaluated argument if the argument is not a number.numlib::prevprime
returns an error if the argument
evaluates to a number which is not an integer.Computing the largest prime <=15485865:
>> numlib::prevprime(15485865)
15485863
There are no primes :
>> numlib::prevprime(1)
FAIL
numlib::prevprime
uses isprime
.