Python: Find the first n Fibonacci numbers

Last update on May 30 2025 11:50:07 (UTC/GMT +8 hours)

Product of Units Digits

Write a Python program to find the product of the units digits in the numbers in a given list.

Input: 10
Output:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
Input: 15
Output:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]
Input: 50
Output:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296, 433494437, 701408733, 1134903170, 1836311903, 2971215073, 4807526976, 7778742049, 12586269025]

Sample Solution-1:

Python Code:

# Define a function named 'test' that generates Fibonacci numbers
def test(n):
    # Initialize a list 'a' with the first two Fibonacci numbers
    a = [1, 1]
    # Continue adding Fibonacci numbers to the list until it reaches the desired count 'n'
    while len(a) < n:
        # Append the sum of the last two numbers in the list to generate the next Fibonacci number
        a += [sum(a[-2:])]
    # Return the first 'n' Fibonacci numbers
    return a[:n]

# Set the value of 'n' to 10
n = 10
# Print a message indicating the task and the value of 'n'
print("\nFind the first",n,"Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

# Set the value of 'n' to 15
n = 15
# Print a message indicating the task and the value of 'n'
print("\nFind the first",n,"Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

# Set the value of 'n' to 50
n = 50
# Print a message indicating the task and the value of 'n'
print("\nFind the first",n,"Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

Sample Output:

Find the first 10 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

Find the first 15 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]

Find the first 50 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296, 433494437, 701408733, 1134903170, 1836311903, 2971215073, 4807526976, 7778742049, 12586269025]

Flowchart:

Sample Solution-2:

Python Code:

# Define a function named 'test' that generates Fibonacci numbers
def test(n):
    # Initialize a list 'result' with the first two Fibonacci numbers
    result = [1, 1]
    # Continue adding Fibonacci numbers to the list until it reaches the desired count 'n'
    while len(result) < n:
        # Append the sum of the last two numbers in the list to generate the next Fibonacci number
        result.append(result[-1] + result[-2])
    # Return the first 'n' Fibonacci numbers
    return result

# Set the value of 'n' to 10
n = 10
# Print a message indicating the task and the value of 'n'
print("Find the first", n, "Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

# Set the value of 'n' to 15
n = 15
# Print a message indicating the task and the value of 'n'
print("\nFind the first", n, "Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

# Set the value of 'n' to 50
n = 50
# Print a message indicating the task and the value of 'n'
print("\nFind the first", n, "Fibonacci numbers:")
# Print the result of the test function applied to 'n'
print(test(n))

Sample Output:

Find the first 10 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

Find the first 15 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]

Find the first 50 Fibonacci numbers:
[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296, 433494437, 701408733, 1134903170, 1836311903, 2971215073, 4807526976, 7778742049, 12586269025]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to calculate the product of the last digit of each number in a list, ignoring any numbers ending in 0.
• Write a Python program to compute the product of the units digits of a sequence of numbers using recursion.
• Write a Python program to extract the units digit from each element in a list and multiply them together, returning the result modulo 100.
• Write a Python program to use reduce() to compute the product of the units digits in a list of integers.

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