18433

Properties

Appears in sequences

• Numbers that are the sum of 10 positive 11th powers.at n=9A004821
• Class 1- (or Pierpont) primes: primes of the form 2^t*3^u + 1.at n=28A005109
• Numbers k such that the continued fraction for sqrt(k) has period 35.at n=31A020374
• a(n) = T(7,n), array T given by A048472.at n=9A048479
• Primes of the form 9*2^n+1.at n=5A050528
• a(0)=0, a(1)=2, a(n) = smallest prime > a(n-1)+a(n-2).at n=19A055502
• a(n) is the least prime p such that p-1 is divisible by 2^n and not by 2^(n+1).at n=11A057775
• Primes of form 1+(2^a)*(3^b), a>0, b>0.at n=23A058383
• Primes of form 2^x + 2^y + 1.at n=30A070739
• a(n) = 512*n + 1.at n=36A076338
• Primes of the form 512*k+1.at n=7A076339
• Primes of the form m*rad(m)+1, where rad = A007947 (squarefree kernel).at n=43A078324
• Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=14A078420
• Primes of the form 2^i + 2^j + 1, i > j > 0.at n=26A081091
• a(n) = 2*a(n-1) - 1 with a(0) = 10.at n=11A083705
• Primes arising in A083769.at n=4A083770
• Primes obtained as the product of successive terms of A084039 + 1, i.e., a(n) = A084039(n)*A084039(n+1) + 1.at n=5A084040
• Primes arising in A084724. a(n) = N-th partial product of A084724 +1.at n=4A084725
• Primes of the form 8*k^2 + 1.at n=7A090685
• Primes of the form 2*n^2+1.at n=17A090698