38516

Appears in sequences

• Numbers k such that 50*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=14A056686
• a(0)=1; a(n) = sigma_2(n) + sigma_3(n).at n=33A092344
• Number of ways to write highly composite numbers (A002182(n)) as the difference of two primes, both <= 2*A002182(n).at n=39A228945
• Number of n X 3 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.at n=9A297219
• Number of n X 3 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero.at n=19A303714
• Triangle read by rows: T(n,k) is the number of unlabeled strongly connected digraphs with n arcs and k vertices, n >= 0, k = 1..n+1.at n=72A350753