144438

Appears in sequences

• a(n) = concatenation of n^2 and n.at n=37A055436
• a(n) = 400*n^2 + 2*n.at n=18A158312
• a(n) = 1444*n^2 + 38.at n=10A158766
• a(n) = Sum_{k=1..n} 2^k * phi(k), where phi is the Euler totient function A000010.at n=12A324913