27983

Properties

Appears in sequences

• Numbers k such that (5^k - 2^k)/3 is prime.at n=17A082182
• Numbers k such that 11k = 6j^2 + 6j + 1.at n=41A106388
• Number of planar n X n X n binary triangular grids with no more than 3 ones in any similarly oriented 4 X 4 X 4 subtriangle.at n=6A153557
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 163", based on the 5-celled von Neumann neighborhood.at n=34A270455
• a(n) = (3 + 2*n - 3*n^2 + 4*n^3 - 3*((-1 + n) mod 2))/6.at n=34A304487
• Primes p such that 2*p+1 and 4*p^2+1 are also prime.at n=34A333803
• The lexicographically earliest sequence of primes, each two of which sum to a triprime (A014612).at n=5A335752
• Primes p, not safe primes, such that the smallest factor of (2^(p-1)-1) / 3 is equal to p.at n=34A360827
• Prime numbersat n=3054