1300000

Appears in sequences

• a(1) = 1; string of digits of a(n)^2 is a substring of the string of digits of a(n+1)^2.at n=7A067634
• Erroneous version of A052218.at n=11A094628
• Numbers of the form (10^i)*(13^j), with i, j >= 0.at n=22A108761
• Integers that can be generated with a C/C++ expression that is three or more characters shorter than their decimal representation.at n=12A168652
• a(n) = 1, 7, A011557*(period 6: repeat 10, 13, 31, 49, 70, 97).at n=33A178508
• Numbers of the form d_1 d_2 d_3 ... where the sum of their digits multiplied by their digit positions is equal to their number of digits.at n=22A381135
• a(n) = n^4*sigma_2(n).at n=10A386783
• Number of 2 X 2 square tiles in a discrete 4-dimensional hypercube of side length n.at n=25A387286