17978

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 15.at n=12A031603
• a(n) = 1 + (number of partitions of n, n>0).at n=36A052810
• Number of basis partitions of n+36 with Durfee square size 6.at n=29A053801
• Number of polyiamonds with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.at n=15A075219
• Number of integer partitions of n with a part dividing all the other parts.at n=37A083710
• Number of connected simple graphs with n vertices, n+2 edges, and vertex degrees no more than 4.at n=10A112619
• Numbers k such that k divides 1 + Sum_{j=1..k} prime(j)^3 = 1 + A098999(k).at n=19A128167
• Expansion of g.f. 1/((1-x)^2*(1 - 3*x + 2*x^2 - x^3)).at n=10A137234
• Sum of divisors of the number of partitions of n.at n=35A139041
• Eigentriangle, row sums = A001850, the Delannoy numbers.at n=43A152250
• G.f.: q-cosh(x,q)^2 - q-sinh(x,q)^2 at q=-x.at n=21A198200
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 3.at n=49A240012
• Numbers n such that 8*9^n - 1 is prime.at n=13A268356
• Positions of squares in A276573.at n=46A277014
• Number of ways to choose a rooted partition of each part in a constant rooted partition of n.at n=37A301761
• Number of integer partitions of n such that (length) * (maximum) >= 2*n.at n=36A361906
• Number of integer partitions of n such that (length) * (maximum) > 2*n.at n=36A361907