935089

Appears in sequences

• Smallest composite k such that phi(k) > k*(1-1/n^2).at n=30A069639
• Determinant of the n X n (0,1)-matrix with (i,j)-entry equal to 1 if and only if i + j is 2 or an odd composite number.at n=39A228591
• a(n) = (1-2*n^2)^2.at n=22A239607
• Numbers k such that concat(k, d(k)) and concat(d(k), k) are both prime, where d(k) is the number of divisors of k.at n=20A284643