423801

Appears in sequences

• Squares of odd pentagonal numbers.at n=10A014769
• Squares which are palindromes in base 5.at n=10A029989
• Numbers k such that n | sigma_10(k) + phi(k)^10.at n=31A055704
• a(n) = n^4 - 2*n^3 + 3*n^2 - 2*n + 1, the Alexander polynomial for reef and granny knots.at n=26A058031
• Squares containing 2k digits in which the sum of the first k digits = that of the rest.at n=17A068897
• Squares of pentagonal numbers: a(n) = (1/4)*n^2*(3*n-1)^2.at n=21A100255
• Least square beginning with the digit reversal of n^2.at n=17A111443
• Squares s(n) such that cube(n)-square(n)-1 and cube(n)+square(n)+1 are primes.at n=21A155931
• Totally multiplicative sequence with a(p) = 10p+1 for prime p.at n=35A166668
• Squares that become a prime number when prefixed with a 2.at n=29A167717
• Squares that become prime numbers when prefixed with an 8.at n=25A167723
• Number of subsets of {1,2,...,n-12} without differences equal to 2, 4, 6, 8, 10 or 12.at n=64A224813
• Odd squares which are the sum of the divisors of some n.at n=5A243810
• Squares representable as k*m + k + m, where k >= m > 1 are squares.at n=33A256074
• Square numbers of the form prime(k) + 2*prime(k+1).at n=26A284057
• a(n) = numerator of Product_{d|n} (sigma(d)/tau(d)) where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of divisors of k (A000005).at n=47A324509
• a(n) = sigma_2(n)^2.at n=24A356533
• Triangular array read by rows. T(n,k) is the number of Green's H-classes contained in the D-class of rank k matrices in the semigroup Mat_n(F_2) of n X n matrices over the field F_2. n>=0, 0<=k<=n.at n=23A359313
• Triangular array read by rows. T(n,k) is the number of Green's H-classes contained in the D-class of rank k matrices in the semigroup Mat_n(F_2) of n X n matrices over the field F_2. n>=0, 0<=k<=n.at n=25A359313
• Odd squares k, multiples of 3 and non-multiples of 5, such that sigma(k)/k >= 5/3.at n=15A388016