167167

Appears in sequences

• Number of chains in the power set lattice of an (n+3)-element set X_(n+3) of specification n^1 2^1 1, that is, n identical objects of one kind, 2 identical objects of another kind and one other kind. It is the same as the number of fuzzy subsets X_(n+3).at n=7A107953
• Perimeter s/6 (divided by 6) of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, s=a+b+c, s-+1 are primes.at n=29A155176
• A217214(n)/2.at n=9A217215
• Numbers k such that 3^k - 34 is prime.at n=26A219051
• Expansion of e.g.f. exp(4*x) / (4 - 3*exp(x)).at n=5A368324