83538

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 34.at n=16A031712
• Palindromes with exactly 7 prime factors (counted with multiplicity).at n=14A046333
• Sum of two powers of 17.at n=11A073213
• Given n colors, sequence gives number of ways to color the vertices of a square such that no edge has the same color on both of its vertices.at n=17A091940
• G.f. A(x) satisfies A097191(x*A(x)) = A(x) and so equals the ratio of the g.f.s of any two adjacent diagonals of triangle A097190.at n=4A097193
• Numbers that cannot be expressed as a sum of 2 triangular numbers and a power of 2.at n=19A112665
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives z numbers.at n=17A125492
• a(n) = 289*n^2 + 17.at n=17A158585
• a(0)=0, a(1)=1, a(2n)=17*a(n), a(2n+1)=a(2n)+1.at n=18A197351
• Sum of 4th powers of proper divisors of n.at n=33A279363
• Coefficients in q-expansion of (E_2*E_4 - E_6)/720, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=17A281372
• Palindromes with exactly 5 distinct prime divisors.at n=13A373465
• Expansion of 1/(1 - 6*x + x^2)^(5/2).at n=5A387341