67712

Appears in sequences

• Expansion of Product_{m>=1} (1+x^m)^16.at n=6A022581
• a(n) = T(n, 2*n-6), T given by A027960.at n=17A027968
• Expansion of 1/(1 - 2*x^2 - 2*x^3).at n=21A052907
• The prime factors of n are also prime factors of the decimal encoding (A067599) of the prime factorization of n.at n=38A067671
• Numbers k such that sigma(k) + phi(k) is a brilliant number (A078972).at n=21A115916
• Numbers with prime signature {7,2}, i.e., of form p^7*q^2 with p and q distinct primes.at n=9A179689
• a(n) = practical(2^n) where practical(n) is the n-th practical number (A005153).at n=13A225316
• Number of edges formed in a square by straight line segments when connecting the four corner vertices to the points dividing the sides into n equal parts.at n=44A355948
• Numbers k for which sqrt(k/2) divides k and the symmetric representation of sigma(k) consists of a single part and its width at the diagonal equals 1.at n=40A365265