44227

Appears in sequences

• Composite and every divisor (except 1) contains the digit 4.at n=28A062670
• Determinant of M(n), the n X n matrix defined by m(i,i) = 1, m(i,j) = i-j.at n=27A079034
• First occurrence of just n semiprimes occurs between the a(n)-th prime and the next prime.at n=28A103669
• Wiener index of a benzenoid consisting of a chain of n hexagons characterized by the encoding s = 1133 (see the Gutman et al. reference, Sec. 5).at n=20A193399
• The average Wiener index of the set of all fibonacenes with n hexagons.at n=18A245969
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.at n=14A261106
• Regular triangle read by rows where T(n, k) is the number of set partitions of {1, ..., n} requiring k steps of removing singletons and cyclical adjacency initiators until reaching a fixed point, n >= 0, 0 <= k <= n.at n=56A306418
• Number of prime parts in the partitions of n into 10 parts.at n=46A309439
• a(n) = Sum_{k=1..n} (n/gcd(k,n))^gcd(k,n).at n=26A342422
• Position of second appearance of 2n in the sequence of prime gaps A001223; if 2n does not appear at least twice, a(n) = -1.at n=40A356221
• Smallest k such that A365092(k) = n.at n=36A365093