21886

Appears in sequences

• a(n) = floor(sqrt(n!)).at n=12A055226
• Nearest integer to sqrt( n! ).at n=12A055227
• a(0)=1, a(n) = 2*Fibonacci(n+4) - 6.at n=17A063758
• Smallest number whose square has sum of digits A056991(n).at n=29A067179
• Square roots of A068809.at n=22A068947
• Number of connected labeled 3-colorable (i.e., chromatic number <= 3) graphs on n nodes.at n=5A084283
• Central coefficients of number triangle A119326.at n=9A119359
• a(n) is the smallest m for which there appears for the first time a prime p which equals odd part of sum of digits of m^2.at n=12A225430
• a(n) = floor(sqrt(n!+1)).at n=12A242766
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) - n, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A294553
• a(n) is the least k > 0 such that the sum of the decimal digits of k^2 is n, or 0 if no such k exists.at n=66A358702