22708

Appears in sequences

• Numbers n such that n | 11^n + 10^n + 9^n + 8^n + 7^n + 6^n + 5^n.at n=31A057264
• Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=24A078420
• Diagonal in array of n-gonal numbers A081422.at n=27A081437
• Number of pairs with two different elements which can be obtained by selecting unique elements from two sets with n+1 and n^2 elements respectively and n common elements.at n=28A085490
• Let p = n-th irregular prime, A000928(n). Then a(n) = smallest value of m such that numerator(Bernoulli(2*m)/(2*m)) / numerator(Bernoulli(2*m)/(2*m*(2*m-1))) equals p.at n=13A092291
• a(n) = 841*n + 1.at n=26A158404
• Number of ways to place 6 nonattacking queens on an n X n board.at n=2A176186
• Numbers that are 4-digit palindromes in at least 2 bases.at n=29A180453
• Smallest palindromic numbers of length 4 in two bases differing by n.at n=12A216843
• Number T(n,k) of ways to place k nonattacking queens on an n X n board; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=42A348129