18224

Appears in sequences

• Number of acyclic tertiary alcohols with n carbon atoms.at n=10A005956
• Numbers whose base-3 representation contains exactly one 0 and no 1's.at n=30A044970
• Pisot sequence L(8,9).at n=26A048590
• Numbers k such that k + 1 has one more divisor than k.at n=22A055927
• a(0)=1, a(n) = 8*n*(2*n-1).at n=34A067239
• Lesser of two consecutive numbers each divisible by a fourth power.at n=34A068782
• Numbers k such that k^4096 + 1 is prime (a generalized Fermat prime).at n=4A088362
• Triangular sequence produced from symmetrical power of two matrices of the general type: M={{1, 3, 7, 31}, {3, 1, 3, 7}, {7, 3, 1, 3}, {31, 7, 3, 1}} with symmetrical primes of the type 2^n-1 A000668 instead of the 2^n of A129964.at n=18A130617
• a(n) = 4*(3*n+1)*(3*n+2).at n=22A144410
• Expansion of f(q) * f(q^5) / phi(-q^2)^2 in powers of q where f(), phi() are Ramanujan theta functions.at n=28A145722
• Nonsquarefree numbers such that n-1 is prime and n+1 is square.at n=32A146980
• Eight times hexagonal numbers: a(n) = 8*n*(2*n-1).at n=34A152750
• Number of nondecreasing integer sequences of length 27 with sum zero and sum of absolute values 2n.at n=13A158161
• a(n) = 729*n - 1.at n=24A158395
• a(n) = (A091137(n)/n!) * Integral_{u=-1..1} u*(u+1)*...*(u+n-1) du.at n=6A195287
• a(n) = n^3 - 2*n^2 - 1.at n=26A214731
• Numbers which are representable as a sum of seventeen but no fewer consecutive nonnegative integers.at n=24A270302
• Let d(n,k) be the n-th divisor of a number k. a(n) is the smallest k such that d(n+1,k+1) = d(n,k) + 1.at n=9A285883
• Let d(n,k) be the n-th divisor of a number k. a(n) is the smallest k such that d(n+1,k+1) = d(n,k) + 1.at n=19A285883
• Numbers k such that k and k+1 are both half-Zumkeller numbers (A246198).at n=7A331371