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Happy #PiDay!

Fun fact: OEIS sequence A057680 highlights "Self-locating strings within pi: numbers n such that the string n is at position n in the decimal digits of Pi, where the initial digit 3 is at position 0":

oeis.org/A057680

For example, the number 1 occurs at the first position of pi (after the "3.") then the next number to do this is 16470 which occurs at the 16470th position of pi (though it occurs earlier at the 1602nd position)!

#Pi#π#πDay

#π²≈g (重力加速度),不完全是一个巧合。曾有人提议用秒摆的长度定义一米,这个定义下,π²≡g。
早在17世纪,荷兰机械师、物理学家、数学家、天文学家和发明家Christiaan Huygens建议使用一个简单的摆来定义米。拿一个小物体,把它悬挂在一根绳子上,绳子的长度应该使得钟摆在两秒钟内完成一次完整的振荡。这根绳子的长度被称为“通用测量单位”或“天主教米”Catholic meter。这个长度与现代米相差约半厘米。

Mistodon: today is the 22nd day of the seventh month, which in some reckonings is displayed as 22/7 ... which happens to be a common and popular (though technically different -- but often "close enough") approximation to the value of the irrational constant #π. This #ANSIart celebration of the occasion was drawn by AdeptApril.

頭の切り替えで、ノー味噌の体操ちう。
そう、π ですけど、とりあえず50桁まで暗唱できた。
一体、何やってんだろ・・・_| ̄|○

3. 141592653589 793238462643 383279502884 197169399375 10

#暗唱#暗記#π