84456

Appears in sequences

• Numbers n such that phi(n) is the sum of the first k divisors of n for some k.at n=23A072278
• Triangle T(n,k) read by rows, given by [0, 1, 0, 1, 0, 1, 0, 1, 0, 1, ...] DELTA [1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, ...] where DELTA is the operator defined in A084938.at n=60A086329
• Triangle read by rows of the numbers T(n,k) (n > 1, 0 < k < n) of set partitions of n of length k which do not have a proper subset of parts with a union equal to a subset {1,2,...,j} with j < n.at n=50A087903
• a(n) = n*(n+1)*(n+7)*(122+57*n+n^2)/120.at n=16A101862
• Numbers that have exactly eight prime factors counted with multiplicity (A046310) whose digit reversal is different and also has 8 prime factors (with multiplicity).at n=15A109028
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.at n=14A147328
• a(n) is the number of solutions to x^y == y^x (mod p) where 0 < x,y <= p^2 - p and p is the n-th prime.at n=11A355069