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[ edit ]
- 例題ファイルとしては，コメントを付け加えた，下記を配布します．
- コメントはもう少し増えるかもしれません．
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# ==============================================================================
# * Copyright (c) 2018 IIJIMA, Tadashi
# * (IIJIMA Laboratory, Dept. of Science and Technology, Keio University).
# ==============================================================================
# ソフトウェア工学[02] 例題[02]-(002a) Ex_02_002a_mersenne_number.py
# Ex(Example) 02-002a: 【関数定義】 メルセンヌ数を求める関数を定義する.
# n番目のメルセンヌ数は，2の冪よりも 1 小さい自然数，すなわち 2^n − 1.
# 2018-10-03 飯島 正 (iijima@ae.keio.ac.jp)
# ==============================================================================
# ===== 【関数定義】 n番目のメルセンヌ数 =====
# ※n番目のメルセンヌ数は，2のn乗-1
def mersenne_number( n ):
return( 2 ** n - 1 )
# ==============================================================================
# ===== 【メイン・プログラム】 =====
# ----- オープニングメッセージ -----
print( "メルセンヌ数を求めます: " )
# ----- パラメータの入力 -----
n = int( input( "正の整数を入力してください>>> " ) );
# ----- 結果の表示 ----
print( " ", n, "番目のメルセンヌ数は ", mersenne_number( n ) )
print()
print( "1～", n, "までのメルセンヌ数列", sep="" )
for i in range( 1, n+1 ):
print( " ", n, "番目のメルセンヌ数は ", mersenne_number( i ) )
# ==============================================================================