342225

Appears in sequences

• n in base 8 is a palindromic square.at n=19A029806
• For the numbers k that can be expressed as k = w+x = y*z with w*x = (y+z)^2 where w, x, y, and z are all positive integers, this sequence gives the corresponding values of w*x.at n=14A057442
• Numbers k such that k is a square and remains a square when its leading digit is increased by one.at n=5A067225
• Squares containing 2k digits in which the sum of the first k digits = that of the rest.at n=15A068897
• Odd doubly abundant numbers (A125639).at n=27A129087
• A certain partition array in Abramowitz-Stegun order (A-St order), called M_3(5)/M_3.at n=48A134274
• Odd abundant numbers whose abundance is odd.at n=4A156942
• a(n) = denominator of (Zeta(2, 1/4) - Zeta(2, n+1/4)), where Zeta is the Hurwitz Zeta function.at n=4A173948
• Irregular triangle of odd primitive abundant numbers (A006038) in which row n has numbers with n distinct prime factors.at n=6A188439
• The numbers n^2 as n runs through the numbers which are palindromes in base 2.at n=49A192775
• Triangle read by rows related to double factorial of odd numbers (A001147).at n=36A230696
• Numbers whose sum of proper square divisors is a palindrome in base 10 having at least two digits.at n=25A232892
• Denominators of the convergents of the generalized continued fraction 2 + 1^2/(4 + 3^2/(4 + 5^2/(4 + ... ))).at n=6A254796
• Primitive numbers whose abundance is positive and odd.at n=30A259231
• Base-8 representation of a(n) is the concatenation of the base-8 representations of 1, 2, ..., n, n-1, ..., 1.at n=4A260858
• Squares of number of partitions into distinct parts.at n=35A304990
• Primitive abundant numbers (A071395) that are squares.at n=0A306796
• Least odd primitive abundant number having its prime signature.at n=21A316116
• Number of permutations tau of {1,...,n} such that k^2 + tau(k)^2 is prime for every k = 1,...,n.at n=20A321610
• Primitive nondeficient numbers sorted by largest prime factor then by increasing size. Irregular triangle T(n, k), n >= 2, k >= 1, read by rows, row n listing those with largest prime factor = prime(n).at n=29A338133