27384

Appears in sequences

• tan(arctanh(x)*sinh(x))=2/2!*x^2+12/4!*x^4+430/6!*x^6+27384/8!*x^8...at n=4A012751
• Denominators of continued fraction convergents to sqrt(305).at n=7A041575
• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=10A112818
• Triangle read by rows: numbers of isomers of unbranched a-4-catapolydecagons.at n=50A120651
• a(n) = prime(n)*(prime(n+1) + 1).at n=37A123134
• Number of base 16 n-digit numbers with adjacent digits differing by three or less.at n=5A126484
• For positive n with prime decomposition n = Product_{j=1..m} (p_j^k_j) define A_n = Sum_{j=1..m} (p_j*k_j) and B_n = Sum_{j=1..m} (p_j^k_j). This sequence gives those n for which A_n and B_n are both prime and B_n = A_n + 2 (i.e., form a twin prime pair).at n=47A185718
• Numbers divisible by at least five of their digits, different and >1.at n=0A187533
• Least number divisible by at least n of its digits, different and > 1.at n=4A187584
• Numbers n representable as x*y + x + y, where x >= y > 1, such that all x's and y's in all representation(s) of n are perfect squares.at n=35A258366
• Numbers k such that (7*10^k + 53)/3 is prime.at n=19A293683
• Array read by antidiagonals: the number of directed elements with area n on the lattice T_{2k+1}.at n=38A296129
• Numbers k such that phi(k) and phi(k+1) are perfect powers (A001597).at n=48A332008