18027

Appears in sequences

• Numbers k such that k and 4*k are anagrams.at n=9A023088
• Denominators of continued fraction convergents to sqrt(883).at n=8A042707
• Row sums of number triangle A114280.at n=15A114281
• a(n) = 729*n - 198.at n=24A156772
• Numbers n such that n, n+1, n+2 are all of the form p*q^2 for distinct primes p,q.at n=6A178032
• Number of (n+1)X(1+1) 0..2 arrays x(i,j) with row sums sum{x(i,j), j=1..1+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing.at n=5A233114
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays x(i,j) with row sums Sum_{j=1..k+1} x(i,j) nondecreasing, and column sums Sum_{i=1..n+1} i*x(i,j) nondecreasing.at n=20A233117
• Numbers x whose digits can be permuted to produce a multiple of x.at n=37A245680
• a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + 3*a(n-5) with a(0) = a(1) = a(2) = a(3) = a(4) = 1.at n=15A247584
• Coordination sequence for (2,6,infinity) tiling of hyperbolic plane.at n=20A265070
• 10^n + a(n) is the least (n+1)-digit prime member of a prime 5-tuple, or a(n) = 0 if no such number exists.at n=7A343635
• Starts of runs of 3 consecutive numbers that have an equal number of even and odd exponents in their prime factorization (A187039).at n=10A348077
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=18A348099
• The number of unit squares enclosed by the rectangular spiral of which the n-th side has length prime(n).at n=34A356465
• Starts of runs of 3 consecutive integers whose exponent of least prime factor in their prime factorization is even.at n=31A365871