80850

Appears in sequences

• Triangle read by rows, the Bell transform of the quartic factorial numbers A007696(n+1) without column 0.at n=24A049029
• The number phi_2(n) of Frobenius partitions that allow up to 2 repetitions of an integer in a row.at n=33A053993
• Composite numbers requiring increasingly larger bases to become prime by base reversal.at n=26A075243
• Numbers with exactly 5 distinct prime divisors {2,3,5,7,11}.at n=26A147572
• a(n) = Product_{d|n, d<n} prime(1+A056239(d)), where A056239(d) gives the weight of the partition whose Heinz-number is d.at n=23A319352
• Triangle read by rows. Let R(n, k) = Y(n, k, B) where Y are the partial Bell polynomials and B is the list [Bernoulli(j, 1), j = 0..n]. T(n, k) are R(n, k) normalized by the lcm of the denominators of the terms in row n (A048803).at n=33A352372
• a(n) is the least number k such that there are exactly n pairs (p,q) of primes with p<q such that p+q = 2*k and that 2*k+p, 2*k+q, p*q-2*k and p*q+2*k are primes.at n=31A354462
• Integers y such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z.at n=0A386901