42967

Properties

Appears in sequences

• Column 0 of triangle A105542, which equals the matrix square of triangle A105540.at n=20A105543
• a(n) = (11*5^n - 7)/4.at n=6A117088
• Primes p such that 8*p^2-2*p-1 divides Fibonacci(p).at n=33A159231
• Primes prime(k) such that prime(k)^2 + prime(k+1)^2 - 1 is a perfect square.at n=8A160054
• Magnetic Tower of Hanoi, number of moves of disk number k, optimally solving the [RED ; NEUTRAL ; BLUE] pre-colored puzzle.at n=11A183113
• a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.at n=23A249797
• Primes p such that both (p^2 + 5)/6 and (p^4 + 5)/6 are prime.at n=30A253925
• Centered 22-gonal primes.at n=27A276262
• Primes that can be generated by the concatenation in base 6, in ascending order, of two consecutive integers read in base 10.at n=24A287306
• Primes prime(k) such that prime(k)^2 + prime(k+1)^2 - 1 is the square of a prime.at n=6A359414
• Prime numbersat n=4492