18718
domain: N
Appears in sequences
- Number of ferrites M_8Y_n that repeat after 6n+40 layers.at n=19A011963
- Numbers k such that sigma(k) = sigma(k+4).at n=23A015863
- Expansion of Product_{k>=1} (1+x^k)^A001055(k).at n=40A066806
- Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k, or 0 if no such k exists.at n=48A069554
- Smallest solution to GCD(x,A004086(x))=7^n.at n=1A072050
- Second entry in row n of triangle in A169950.at n=27A169952
- Number of ways to place 2 non-attacking wazirs on an n X n toroidal board.at n=13A201236
- A217941(n)/2.at n=13A217942
- Number of compositions (ordered partitions) of n into at most 5 squarefree parts.at n=41A347780
- Number of distinct, irreducible ways that a Pythagorean hyperrectangle of 2 or more dimensions can produce diagonal length n.at n=47A375338