214600

Appears in sequences

• Numbers k with property that sum of divisors of k-th triangular number is some m-th triangular number.at n=27A175849
• v(n+1)/v(n), where v=A203589.at n=2A203590
• E.g.f. equals the series reversion of sin(x) / exp(x).at n=6A227464
• a(n) = n*(4*n - 3)*(16*n^2 - 12*n - 3).at n=8A264895
• Numbers k such that [prime(k), prime(k+1), prime(k+2), prime(k+3)] == [1, 2, 3, 4] (mod 11).at n=19A302772