159120
domain: N
Appears in sequences
- One half of octo-factorial numbers.at n=4A034908
- a(n) = sigma(n!).at n=8A062569
- a(n) = 4*(3*n+2)*(2*n+1)*(n+2)*(n+1).at n=9A155122
- a(n) = sigma((n!!)!).at n=4A167368
- Numbers with prime factorization pqrs^2t^4.at n=18A190384
- Denominators of the partial alternating sums of the reciprocals of the sum of unitary divisors function (A034448).at n=30A379516
- Totient numbers where a record gap appears in the list (A002202).at n=13A392633