13920029

Appears in sequences

• Numerator of 1/n + 2/(n-1) + 3/(n-2) + ... + (n-1)/2 + n.at n=20A027612
• Numerator - denominator in n-th harmonic number, 1 + 1/2 + 1/3 + ... + 1/n.at n=21A064169
• Numerator of the Harary number for the path graph P_n.at n=21A160048
• Numerator of sum of reciprocals of numbers less than n that do not divide n.at n=22A281085