53410

Appears in sequences

• Numbers k such that 80*R_k + 9 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=11A056663
• Number of squares (of another matrix) in M_2(n) - the ring of 2 X 2 matrices over Z_n.at n=21A068197
• Numbers m such that A076644(m) = floor((2/3)*m*(sqrt(m)+1)).at n=29A076660
• Number of indecomposable groups of order 2^n.at n=8A094448
• Number of (w,x,y) with all terms in {0,...,n} and x != min(|w-x|, |x-y|).at n=37A213502