33003

Appears in sequences

• Numbers k such that 2*6^k - 1 is prime.at n=39A057472
• Numbers k such that sigma(sigma(k)-k) = phi(k).at n=13A074875
• Smallest multiple of n using only digits 0 and 3.at n=18A078242
• Numbers k such that phi(k) = tau(k)^4, where tau(k) = A000005(k).at n=5A114063
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 8 and 9.at n=53A136852
• Numbers whose decimal expansion contains only 0's and 3's.at n=25A169966
• Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one, two or three distinct values, and new values 0..3 introduced in lower triangle row major order.at n=2A210832
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 790", based on the 5-celled von Neumann neighborhood.at n=38A273562