26665

Appears in sequences

• a(n) is the number of conjugacy classes in the alternating group A_n.at n=41A000702
• Let p = first digit of n, q = number obtained if p is removed from n; let r = last digit of n, s = number obtained if r is removed from n; sequence give n such that p*q = r*s != 0, p! = q, and r! = s.at n=33A245364
• Numbers N such that N = P//Q = R//S, where // is the concatenation function, satisfying the following properties: P and S are m-digit integers, Q and R are k-digit integers, k and m are distinct positive integers, and P*Q = R*S.at n=35A245385
• Numbers in A245385 where P, Q, R, and S are all distinct.at n=15A245386
• Numbers k such that phi(k-1)+1 divides sigma(k).at n=9A256439
• Integers without 0 as a digit, with an odd number of digits, that are not repdigits, and such that the 2 products [d_1 d_2...dk]*[d_k+1 d_k+2...d_2k+1] and [d_1 d_2...d_k+1]*[d_k+2 d_k+2...d_2k+1] are equal.at n=8A385145