18073

Appears in sequences

• Number of partitions of n into 7 unordered relatively prime parts.at n=50A023027
• Numbers n such that n | 11^n + 10^n + 1.at n=14A057294
• Denominators of convergents to Pi by Farey fractions.at n=27A063673
• sigma(n) + n is a square.at n=36A114069
• Number of 2 X 2 matrices with all elements in {-n,..,0,..,n} with permanent = determinant * n.at n=29A280407
• Number of n X n 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=10A280434
• Numbers k such that the largest prime divisor of k^4+1 is less than k.at n=20A309562