262657

Properties

Appears in sequences

• a(n) = 1^n + 2^n + 4^n.at n=9A001576
• a(n) = least primitive factor of 2^(2n+1) - 1.at n=13A002184
• a(n) = largest noncomposite factor of 2^(2n+1) - 1.at n=13A002588
• Numbers that are the sum of 3 positive 9th powers.at n=11A003392
• Primes of form (p^x - 1)/(p^y - 1), p prime.at n=29A003424
• Divisors of 2^27 - 1.at n=4A003535
• Numbers that are the sum of at most 3 positive 9th powers.at n=24A004887
• Largest prime factor of 2^n - 1.at n=25A005420
• a(n) = sigma_9(n), the sum of the 9th powers of the divisors of n.at n=3A013957
• Numerator of sum of -9th powers of divisors of n.at n=3A017681
• Cyclotomic polynomials at x=2.at n=27A019320
• Cyclotomic polynomials at x=8.at n=9A019326
• Cyclotomic polynomials at x=-8.at n=18A020507
• 9th cyclotomic polynomial evaluated at powers of 2.at n=3A020517
• Base 8 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=6A033144
• Sums of 3 distinct powers of 8.at n=23A038485
• Numbers whose cube is palindromic in base 8.at n=11A046239
• a(n) = 1 + 2^k + 4^k where k = 3^n.at n=2A051154
• a(n) = (2^p^3 - 1)/(2^p^2 - 1) where p = n-th prime.at n=1A051157
• Palindromic primes in bases 2 and 8.at n=6A056145