167790

Appears in sequences

• Sum of n-th Lucas number greater than 3 and n-th number that is 1 or is not a Fibonacci number.at n=22A023489
• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly one way.at n=19A076454
• a(1)=1. a(n) = Sum_{1<=k<n, gcd(k,n(n+1))=1} a(k).at n=49A125596
• Number of reduced words of length n in Coxeter group on 21 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=4A163145
• Expansion of (1+4*x+x^2)/((1+x)^2*(1-x)^5).at n=38A233329
• Number of Sommerville symmetrical cyclic compositions (on symmetric necklaces) of n that are Carlitz (adjacent parts on the circle are distinct).at n=43A292200
• Products of 6 distinct primes that are sandwiched between semiprime numbers.at n=17A378627