35105

Appears in sequences

• a(n) is the concatenation of n and 3n.at n=34A019551
• Second elementary symmetric function of 3,4,...,n+3.at n=19A024183
• Quasi-Carmichael numbers to base -7: squarefree composites n such that prime p|n ==> p+7|n+7.at n=12A029567
• Number of 8k+3 primes (A007520) in range [2^n,2^(n+1)].at n=20A095010
• a(1) = 2, thereafter a(n) = Sum_{k=1..n-1} floor(a(n-k)/k).at n=24A100483
• Smallest order of the cyclotomic polynomial whose maximal coefficient in absolute value is n.at n=17A136418
• Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) is not coefficient convex.at n=14A146960
• a(n) = n*(n+1)*(5*n+7)/6.at n=34A162148
• Sum of the abscissae of the first returns to the horizontal axis (assumed to be 0 if there are no such returns) in all dispersed Dyck paths of length n (i.e., Motzkin paths of length n with no (1,0) steps at positive heights).at n=15A191313
• Numbers n such that 11n is a partition number.at n=25A225323
• The least k such that the polynomial cyclotomic(k,x) has n different coefficients.at n=35A231611
• First occurrence of n in A345079, or -1 if n does not occur in A345079.at n=36A345080
• Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 3*x, p(n,x) = u*p(n-1,x) + v*p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - x - x^2.at n=51A367208
• Composite squarefree integers for which the sum of the squares of their factors is a square.at n=23A379780