221841

Appears in sequences

• List of pairs of consecutive refactorable numbers.at n=15A036898
• Odd squares not in A113659.at n=16A103962
• Squares s(n) such that cube(n)-square(n)-1 and cube(n)+square(n)+1 are primes.at n=18A155931
• Squares that become prime numbers when prefixed with an 8.at n=20A167723
• The numbers n^2 as n runs through the numbers which are palindromes in base 2.at n=44A192775
• Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=9A207365
• Determinant of the n X n matrix with (i,j)-entry equal to 1 or 0 according as i + j and 4*(i + j)^2 + 1 are both prime or not.at n=51A228561
• Squares whose digits are powers of 2.at n=17A272884
• Squares whose arithmetic mean of digits is 3 (i.e., the sum of digits is 3 times the number of digits).at n=23A316483
• Perfect powers whose digits are all powers of the same single-digit base.at n=22A385351
• Squares which are the concatenation of two or more powers of 2.at n=30A392102