19607

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 40.at n=6A031718
• a(0) = 0; a(n) = 7*a(n-1) + 7.at n=5A104896
• Number of monic irreducible polynomials of degree n in GF(7)[x1,x2,x3,x4,x5].at n=1A115472
• Floor(n*exp(tan n)).at n=13A134895
• a(n) = n^5 + n^4 + n^3 + n^2 + n.at n=7A152031
• a(n) = 49*n^2 + 7.at n=19A158481
• Number of strings of numbers x(i=1..7) in 0..n with sum i^4*x(i) equal to 2401*n.at n=17A184353
• Triangle by rows T(n,k), showing the number of meanders with length 5(n+1) and containing 5(k+1) L's and 5(n-k) R's, where L's and R's denote arcs of equal length and a central angle of 72 degrees which are positively or negatively oriented.at n=34A197654
• Numbers that have all their divisors in A002191 (possible values for sigma(n), A000203).at n=43A243765
• Number of Motzkin paths of length n with no level steps at height 2.at n=13A252354
• Numbers k such that 'k-1' prepended to 'k' k times yield primes.at n=5A267237
• Sum T(n,k) of the entries in the k-th cycles of all permutations of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=23A285439
• Numbers of the form p*q, where p is prime and q=(p^k-1)/(p-1) is also prime for some integer k>1.at n=9A330832
• Number of asymmetric multidimensional n-ominoes with cell centers determining n-3 space.at n=5A355056
• Square array A(i,j), i >= 0, j >= 0, read by antidiagonals: A(i,j) = Sum_{|X|=0..i} Sum_{|Y|=0..i} Product_{k=1..j} (1+X(k)+Y(k)), where X and Y are multi-indices of length j.at n=31A358628
• Nonprime-powers k such that, for any prime p dividing k and m = 1+floor(log k/log p), rad(p^m (mod k)) divides k, where rad = A007947.at n=17A381750
• Numbers k in A024619 such that all residues r (mod k) in row k of A381801 are such that rad(r) divides k, where rad = A007947.at n=11A382438