34951

Appears in sequences

• Draw a line through every pair of points with coordinates (x, 1) and (x', 2) with x, x' in 1..n, and then count the number of intersection points above the line y = 2.at n=26A092275
• Numbers k such that sigma(k) - phi(k) is a 4th power.at n=30A115918
• a(n)=(n^5-n-30)/30.at n=16A131211
• Numbers that are the product of two distinct primes and they are partial sum of products of two distinct primes.at n=39A168476
• Difference between the smallest 10^n-digit member of a sexy prime pair and 10^(10^n - 1).at n=2A239007
• Numbers k such that A033461(k) is divisible by k.at n=37A304028
• a(n) = Sum_{k=0..n} (k*n)^(n-k).at n=6A349969
• Expansion of (1/x) * Series_Reversion( x / (1 + x^3 * (1 + x)^4) ).at n=14A389156