197698279

Properties

Appears in sequences

• Numerator of 1/n + 2/(n-1) + 3/(n-2) + ... + (n-1)/2 + n.at n=17A027612
• Numerator - denominator in n-th harmonic number, 1 + 1/2 + 1/3 + ... + 1/n.at n=18A064169
• Numerators of row sums of array of rationals A038566(n)/A020653(n), n>=2.at n=17A111992
• Primes in A027612.at n=4A124878
• Numerator of the Harary number for the path graph P_n.at n=18A160048
• Prime numbersat n=10958517