368649

Appears in sequences

• Concatenations of two squares in two ways.at n=25A038670
• Numbers that are in more than one way the concatenation of the decimal representation of two nonzero squares.at n=25A192993
• a(n) is equal to the sum of the factorials of the digits of a(n-1), with a(1) = 0; each time a duplicated term appears, we replace it with the smallest integer not yet in the sequence and iterate.at n=50A351328
• Expansion of (1/(2*x)) * Series_Reversion( x / ((1+x)^2 * (x+2*(1+x)^2)) ).at n=5A388913