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in /home/meron/www/set/php/xml_r.php on line 35
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in /home/meron/www/set/php/xml_r_code.php on line 35
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in /home/meron/www/set/php/xml_r_count.php on line 31
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in /home/meron/www/set/php/xml_r_img.php on line 29
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in /home/meron/www/set/php/index/index_img.php on line 29
無いようです。index_img
Sum of i times 2 to the power of i-1 ... Σ i (2i-1) 題のような和を考えてみた。 ... Σi(2i-1) 1. 1. 2. 5. 3. 17. 4. 49. 5. 129. 6. 321. 7. 769 ... Σi(2i-1) まず気付くのは、値が全て奇数、であるということ。 ... http://tnt.math.metro-u.ac.jp/~tetsushi/math/sum.html