Tag Archives: 整数論

Perfect Number and Semi-Perfect Number (Ruby)


I wrote the code to check perfect number and semipefrect number in Ruby. Semiperfect number is also called pseudoperfect number.

Continue reading Perfect Number and Semi-Perfect Number (Ruby)

(日本語) 整数論的関数の反転公式 メビウスの反転公式


Sorry, this entry is only available in 日本語.


(日本語) ピタゴラス数: ディオファントスの式


Sorry, this entry is only available in 日本語.