142100

Appears in sequences

• Number of walks on square lattice.at n=24A005565
• a(n) = 169*n^2 - n.at n=28A157998
• a(n) = 841*n^2 - 29.at n=12A158667
• Exponential weird numbers: numbers that are exponential abundant (A129575) but not exponential pseudoperfect (A318100).at n=7A321146
• Coreful weird numbers: numbers k that are coreful abundant (A308053) but no subset of their aliquot coreful divisors sums to k.at n=7A339939
• a(n) is the smallest integer k > n such that sqrt(1/n + 1/k) is a rational number; or 0 if no such k exists.at n=28A379815
• a(n) is the smallest nonnegative integer k such that n + k and n*k are squares, or -1 if there is no such number.at n=28A383898