665874

Appears in sequences

• Numbers n such that 177*2^n-1 is prime.at n=33A050840
• Let x be the sum of the divisors d_i of k such that d_i | sigma(k). Sequence lists the numbers k for which x^3 = sigma(k).at n=15A284284
• Total semiperimeter of 2-Fuss-Catalan polyominoes of length 2n.at n=7A361960
• a(n) is the sum of all symmetric valleys in the set of Catalan words of length n.at n=13A371964