161162

Appears in sequences

• Numbers n such that sopfr(n-1) | (n+sopfr(n+1)) and sopfr(n+1) | (n+sopfr(n-1)), where sopfr = A001414 (sum of prime factors with repetition).at n=12A196994
• Determinant of the n X n matrix with (i,j)-entry equal to 1 or 0 according as i + j is squarefree or not.at n=23A228549
• a(n) = n*(n + 5)*(n + 7)*(n + 10)/24 + 1.at n=39A323220