54285

Appears in sequences

• 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3.at n=13A024391
• Odd numbers with exactly 5 distinct prime factors.at n=24A046391
• Smallest j with n nodes in its riff (rooted index-functional forest).at n=18A062860
• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=25A073873
• a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 if n odd, a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 - F(5) if n even, where F(n) is the n-th Fibonacci number (A000045).at n=10A080144
• Row sums of triangle A093922.at n=24A093925
• Numbers n such that the middle coefficient of the cyclotomic polynomial Phi_n(x) has a value not obtained for any smaller n.at n=29A095877
• Odd squarefree abundant numbers.at n=19A112643
• Odd unitary abundant numbers.at n=19A129485
• Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=35A136418
• Triangle read by rows. T(n,k) = binomial(n,k)*(binomial(n,k)-1)/2.at n=48A143418
• a(n) = A061037(7*n+2).at n=33A165943
• Triangle, read by rows, T(n, k) = A059481(n,k)*(A059481(n,k) - 1)/2.at n=31A171379
• Products of 5 distinct primes a,b,c,d,e, such that a+b+c+d+e are prime numbers.at n=5A178782
• Wiener index of the n-web graph.at n=34A180576
• Number of all possible tetrahedra of any size, having reverse orientation to the original regular tetrahedron, formed when intersecting the latter by planes parallel to its sides and dividing its edges into n equal parts.at n=43A216172
• Triangular numbers whose binary conversion, read in decimal, is prime.at n=12A227028
• Primitive, odd, squarefree abundant numbers.at n=19A249263
• a(n) = F(n)^2 + 4*(-1)^n = F(n+3)*F(n-3), where F = A000045.at n=13A292612
• Squarefree primitive abundant numbers (first definition: having only deficient proper divisors).at n=39A298973