62941

Appears in sequences

• Numbers n such that 2^n - 21 is prime.at n=30A057202
• Numbers k such that 2^k - 21 is prime.at n=26A096820
• Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k distinct columns and any number of distinct nonzero rows with column sums n and rows in decreasing lexicographic order.at n=38A331160
• Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with each column sum being 2 and rows in decreasing lexicographic order.at n=6A331316
• Series expansion of the exponential generating function exp(ff6^!(x)) - 1 where ff6^!(x) = x * (1-3*x-x^2+x^3) / (1+3*x+x^2-x^3).at n=6A383995