23569

Appears in sequences

• [ (3rd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 1 mod 4}.at n=12A024386
• Least k such that decimal representation of k*n contains only digits 0 and 7.at n=32A096686
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.at n=15A147039
• 7 times heptagonal numbers: a(n) = 7*n*(5*n-3)/2.at n=37A152777
• Partial sums of A299254.at n=24A299260
• Numbers n=2*k-1 where Sum_{j=1..k} (-1)^(j+1) * d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).at n=19A318737
• Integers k such that k^2 can be written as the sum of three positive fourth powers.at n=6A365657