20000

Appears in sequences

• a(1)=0, a(2n) = a(n)+1, a(2n+1) = 10*a(n+1).at n=48A001202
• a(n) = floor(10000*log_2(n)).at n=3A004268
• a(n) = round(10000*log_2(n)).at n=3A004269
• a(n) = ceiling(10000*log_2(n)).at n=3A004270
• Cubes written in base 4.at n=7A004634
• Powers of 2 written in base 4.at n=9A004643
• Powers of 2 written in base 8.at n=13A004647
• Powers of 2 written in base 16.at n=17A004655
• Triangle of coefficients in expansion of (1+10x)^n.at n=24A013617
• Triangle of coefficients in expansion of (2+5x)^n.at n=24A013621
• Triangle of coefficients in expansion of (4 + 5*x)^n.at n=18A013628
• Numbers k such that k^2 contains exactly 2 distinct digits.at n=30A016069
• n written in fractional base 4/2.at n=32A024630
• Numbers of form 2^i*10^j, with i, j >= 0.at n=40A025612
• Numbers k such that k^2 + k + 4 is a palindrome.at n=10A027716
• Numbers k such that k^2 has digits in nonincreasing order.at n=36A028821
• a(0) = 0; for n>0, a(n) is the smallest number greater than a(n-1) which does not use any digit used by a(n-1).at n=36A030283
• a(n) is the smallest k > a(n-1) such that k^2 has no digit in common with a(n-1)^2.at n=46A030287
• Numbers k such that k^3 has at most two different digits.at n=14A030292
• Numbers k such that k^3 has at most three different digits.at n=49A030294