22020

Appears in sequences

• In the list of divisors of n (in base 3), each digit 0-2 appears equally often.at n=16A045811
• Smallest term of first run of (at least) n consecutive integers which are not squarefree.at n=5A045882
• Starts of runs of exactly 6 consecutive nonsquarefree numbers.at n=0A049535
• Smallest term of first run of exactly n consecutive integers which are not squarefree.at n=5A051681
• a(n)^2 is a square whose decimal expansion digits occur with an exact frequency of 3.at n=9A052095
• Start of the first occurrence of n consecutive numbers divisible by a square greater than 1.at n=5A069021
• Least of four consecutive numbers which are cubefree and not squarefree, i.e., numbers k such that {k, k+1, k+2, k+3} are in A067259.at n=9A071320
• a(n) = a(n-1) - a(n-2) + a(n-3) + a(n-4), a(0)=4, a(1)=1, a(2)=-1, a(3)=1.at n=40A073937
• Reflected tetranacci numbers A073817.at n=40A074058
• Starts for strings of at least five consecutive nonsquarefree numbers.at n=10A078144
• Smallest number m such that A124300(m) >= n.at n=5A124301
• Take the base-3 representation of n, render that in decimal notation and take the base-3 representation of n again.at n=26A126135
• a(n) = largest multiple of n which is < exp(n).at n=9A128104
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.at n=30A136885
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=49A136900
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 8.at n=35A136904
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=38A136906
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 8.at n=21A136908
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9.at n=32A136909
• a(n) = 1000*n + 20.at n=21A157510