427455

Appears in sequences

• Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 2 1's in any row.at n=12A162036
• Odd numbers k for which A003961(k) > 2*k and A003961(k)-2*k OR A003961(k)-sigma(k) = A003961(k)-2*k, where OR is bitwise-or (A003986) and A003961 is fully multiplicative with a(p) = nextprime(p).at n=17A388029