240219

Appears in sequences

• a(n) = Sum_{1<=k<=n, gcd(n,k)=1} (-1)^(n-k)*Stirling1(n,k).at n=8A096314
• Odd octagonal pyramidal numbers.at n=31A218326
• Numbers n such that prime(n) + {1, 2, 3, 4, 5, 6} are all products of the same number of primes (not necessarily all distinct).at n=24A255202