66047

Properties

Appears in sequences

• Primes of form p^2 - 2, where p is prime.at n=24A049002
• Primes p of form q^k-2 where q is also a prime and k > 1.at n=34A053705
• Number of n X n circulant singular matrices over GF(2).at n=16A086324
• Primes of the form (2^n + 1)^2 - 2 = 4^n + 2^(n+1) - 1.at n=5A091514
• a(n) = (2^n + 1)^2 - 2.at n=7A093069
• 2*JacobiSymbol(p,5) mod p^2 for p=prime(n).at n=54A113651
• Smallest m such that A116361(m) = n.at n=17A116362
• Number of dissimilar squarefree quaternary words of length n.at n=13A118311
• Expansion of x*(2 - 7*x + 2*x^2)/((1-x)*(1-4*x)*(1-2*x)).at n=8A130567
• Primes p such that p^2 - 8, p^2 - 6 and p^2 - 2 are prime.at n=22A176960
• Primes of the form p^q - q, where p and q are primes.at n=26A182474
• Fajtlowicz p-primes.at n=52A185955
• Smaller of Fermi-Dirac twin primes (A229064) which are not the smaller of twin primes (A001359).at n=30A229500
• Primes of the form m = 2^i + 2^j - 1, where i > j >= 0.at n=42A239712
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 809", based on the 5-celled von Neumann neighborhood.at n=16A286858
• Primes that can be generated by the concatenation in base 7, in descending order, of two consecutive integers read in base 10.at n=39A287309
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 553", based on the 5-celled von Neumann neighborhood.at n=16A289370
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 777", based on the 5-celled von Neumann neighborhood.at n=17A290293
• Least k such that A000790(k) = A108574(n).at n=36A326610
• Numbers k such that tau(k) and tau(k+2) are both prime, where tau is the number of divisors function (the lesser of twin prime pairs are excluded).at n=32A343495