Python: nth Hamming number
26. Nth Hamming Number
Write a Python program to find the nth Hamming number. Use the itertools module.
Hamming numbers are numbers of the form
H = 2i x 3j x 5k
Where i, j, k ≥ 0
The sequence of Hamming numbers 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 27. . . consists of all numbers of the form 2i.3j.5k where i, j and k are non-negative integers.
Sample Solution:
Python Code:
import itertools
from heapq import merge
def nth_hamming_number(n):
def num_recur():
last = 1
yield last
x, y, z = itertools.tee(num_recur(), 3)
for n in merge((2 * i for i in x), (3 * i for i in y), (5 * i for i in z)):
if n != last:
yield n
last = n
result = itertools.islice(num_recur(), n)
return list(result)[-1]
print(nth_hamming_number(8))
print(nth_hamming_number(14))
print(nth_hamming_number(17))
Sample Output:
9 20 27
For more Practice: Solve these Related Problems:
- Write a Python program to compute the nth Hamming number using a generator and itertools.merge.
- Write a Python program to generate Hamming numbers in order and then use itertools.islice to select the nth element.
- Write a Python program to create an iterator for Hamming numbers and filter out numbers not matching the criteria until the nth is found.
- Write a Python program to build a Hamming number sequence using dynamic programming and itertools, then return the nth element.
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Python Code Editor:
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