121024

Appears in sequences

• Numbers k such that k-3, k-5, k-17, k-257, and k-65537 are all primes.at n=26A063825
• Integers k such that numerator and denominator of sigma(k)/k are both prime.at n=18A247086
• Let s0 and s1 be the sums of the reciprocals of the even and odd divisors of n, respectively. The sequence lists the numbers n such that 3*s0 - 2*s1 = 1.at n=2A257996
• Numbers whose palindromization is a perfect power.at n=35A342942
• Primitive terms in A066192: number k such that k is a term of A066192 and k/2 is not.at n=26A383428