57123

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 0, 1, 1, 0.at n=25A025250
• Numbers k such that k^12 == 1 (mod 13^4).at n=24A056095
• Start with 1 and repeatedly reverse the digits and add 74 to get the next term.at n=40A118225
• Central element of a series of 5 successive nonsquarefree numbers.at n=39A188296
• Expansion of (1 - 6*x + x^2 - 8*x^3 + 16*x^4)^(-1/2).at n=7A298611
• Generalized Somos-5 sequence with a(n) = (-a(n-1)*a(n-4) + 42*a(n-2)*a(n-3))/a(n-5), a(-n) = a(n), a(0) = a(1) = 1, a(2) = 3.at n=6A360187