20022

Appears in sequences

• n written in fractional base 4/2.at n=38A024630
• Number of partitions of n into parts not of the form 11k, 11k+5 or 11k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 4 are greater than 1.at n=44A035948
• Smallest oblong (promic) number containing exactly n 2's.at n=2A048534
• a(n)^2 is a square whose decimal expansion digits occur with an exact frequency of 3.at n=6A052095
• Numbers k such that k^2 contains only digits {0,4,8}, not ending with zero.at n=8A058441
• Squarefree numbers of the form (prime(k)+1)*(prime(k+1)+1)/4.at n=12A079095
• 4-Smith numbers.at n=17A103125
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.at n=24A136885
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=38A136900
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 8.at n=29A136904
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=33A136906
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 8.at n=16A136908
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9.at n=26A136909
• a(n) = (4*n+1)*(4*n+2) = (4*n+2)!/(4*n)!.at n=35A157870
• Numbers consisting of either 2's and 0's or 5's and 0's.at n=27A168541
• Numbers whose decimal expansion contains only 0's and 2's.at n=19A169965
• Least natural number n in increasing order such that the sum of decimal digits is equal to A001223(n).at n=38A179462
• Numbers 3*n + 2 written in base 3.at n=56A190642
• Numbers k such that k^2 has only digits 0, 4 and 8.at n=18A202170
• Numbers that are both interprime and oblong.at n=36A263676