(π/n) { sin2 (π/n) + sin2 (2π/n) +・・・+ sin2 (nπ/n) } 1/ (n+1) + 1/ (n+3) + ・・・+1/ { n+(2n-1) } (ハイレベル) n / (12 + 3n2) + n / (22 + 3n2) +・・・+n / (n2 + 3n2) { sin (π/n)3 + sin(2π/n)3 + ・・・+ sin(nπ/n)3 } (π/n) (n+1) / (n2+1) …

n-1Σk=0 1 / √ ( 4n2 - k2 ) nΣk=1 n / (n+k)(3n+k) 3nΣk=n+1 1 / ( k2 -2nk -8n2 ) 1/n { (1/n)2 + (2/n)2 + ・・・+(n/n)2 } ( 16 +26 +36 +・・・n6 ) / n7 (1/n) { 33 + (3-1/n)3 +(3-2/n)3 +・・・+( 3- (n-1)/n )3+23 } { n /(n+1)2 + n /(n+2)2 + ・…