179972

Appears in sequences

• Starts of runs of exactly 6 consecutive nonsquarefree numbers.at n=14A049535
• Numbers n such that 5*10^n-1 is prime.at n=20A056712
• Number of (non-null) connected induced subgraphs in the n-flower graph.at n=4A362807
• Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 3 + 3*x, p(n,x) = u*p(n-1,x) + v*p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - 2*x - x^2.at n=41A367301