61961

Properties

Appears in sequences

• Numbers k such that in the ring Z[sqrt(3)] the norm of (-1+sqrt(3))^k-1 is prime.at n=22A067834
• Number of planar n X n X n binary triangular grids symmetric under 120-degree rotation with no more than 1 one in any 3 X 3 X 3 subtriangle.at n=17A153899
• Primes of the form 8n^2 + 9.at n=30A201705
• Primes having only {1, 6, 9} as digits.at n=41A363023
• Prime numbersat n=6227