30017
domain: N
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 71.at n=30A020410
- Number of 2 X 2 matrices having all terms in {1,...,n} and even determinant.at n=14A211064
- Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even determinant.at n=7A211154
- Number of length n+4 0..6 arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=6A248985
- Number of length 7+4 0..n arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=5A248994
- Number of n X 3 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=8A300961
- T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=57A300966
- Semiprimes k such that k+4, k+6, k+9, k+10 and k+14 are also semiprimes.at n=8A360666
- Numbers k such that k + 4, k + 6, k + 9, k + 10, and k + 14 are all semiprimes, where 4, 6, 9, 10, 14 are the first 5 semiprimes.at n=23A365240