50011

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 1, 2 and 5.at n=54A136822
• Expansion of Product_{k>=0} 1/(1-x^(4*k+1))^(4*k+1).at n=39A285048
• Record values in A057192, until A350118(n) reaches the smallest prime Sierpiński number and then sequence terminates with a(n) = -1.at n=10A350119