300060
domain: N
Appears in sequences
- Numbers k such that k and k^2 use only the digits 0, 2, 3, 6 and 9.at n=32A136894
- Numbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 9.at n=38A136932
- Numbers k such that k and k^2 use only the digits 0, 3, 5, 6 and 9.at n=30A136939
- Numbers k such that k and k^2 use only the digits 0, 3, 6, 7 and 9.at n=31A136944
- Numbers k such that k and k^2 use only the digits 0, 3, 6, 8 and 9.at n=56A136945
- Numbers k such that k and k^2 use only the digits 0, 3, 6 and 9.at n=29A136946
- The number of 1-length gaps in all possible covers of n-length line by 2-length segments.at n=39A228577
- Value of A121805(k) for k = A367358(n).at n=33A367359
- a(n) = Sum_{k=0..n} (k+1) * binomial(k,2*(n-k)).at n=19A391962