20571

Appears in sequences

• Decimal part of cube root of a(n) starts with 4: first term of runs.at n=26A034130
• (Sum of composites among next n numbers)-(sum of primes among next n numbers).at n=38A094338
• a(n) = n^4 - 15*n + 15.at n=11A107253
• a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.at n=22A330128
• Expansion of g.f.: 1/(Sum_{p prime} x^p)^2.at n=18A352500