18965

Appears in sequences

• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 17.at n=26A051982
• Smallest m such that A065623(m) = n.at n=37A065624
• Numbers n such that mu(n) + mu(n+1) + mu(n+2) + mu(n+3) + mu(n+4) + mu(n+5) + mu(n+6) = 6.at n=17A082967
• Size of the Hilbert basis of the cone { x in Z+^n : (a,x)=0 } where a=(-1,1,2,...,n-2,-(n-1)).at n=19A141347
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.at n=10A148573
• a(0)=a(1)=1, a(n) = a(n-1) + a(a(n-2) mod n).at n=41A215525
• Square array T(n,k), n >= 1, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=1..n} j^k * binomial(floor(n/j)+1,2).at n=58A356124
• Number of integer partitions of n containing all of their own nonzero first differences.at n=45A364674