102720

Appears in sequences

• Maximal term in trajectory of P under the 'Px+1' map, where P = n-th prime, or -1 if no such term exists.at n=15A057689
• a(n) =(A001359[n]^2-1)/2.at n=28A117849
• The smallest pronic (A002378) that contains the digits of n in its exact middle.at n=27A163597
• Expansion of 1 / (1 - 2 * Sum_{k>=1} x^(k^2)).at n=15A329971