68449

Properties

Appears in sequences

• "CGK" (necklace, element, unlabeled) transform of 2,1,1,1,...at n=32A032157
• Every digit of prime and its index contains a loop (only digits 0,4,6,8,9 in prime and its index).at n=10A107625
• a(n) = 128*n^2 + 32*n + 1.at n=22A157337
• 128n^2 + 2336n + 10657.at n=13A157433
• Primes using only the composite digits (4, 6, 8, 9) and all of them.at n=6A157527
• a(n) = 50*n^2 - 1.at n=36A157919
• Primes that become squares when prefixed with a 3.at n=7A167736
• primes of the form 5n^2 + 4.at n=7A201483
• Centered 16-gonal (or hexadecagonal) primes.at n=38A264823
• Prime numbers p such that all prime factors of p+1 and p-1 are smaller than the cube root of p.at n=27A283791
• Primes p1 such that the sum of 9 consecutive primes, p1+p2+p3+p4+p5+p6+p7+p8+p9, and the three sums (p1+p2+p3), (p4+p5+p6), (p7+p8+p9) are all prime numbers.at n=26A343683
• Primes p that can be written as phi(k) + d(k) for some k, where phi(k) = A000010(k) is Euler's totient function and d(k) = A000005(k) is the number of divisors of k.at n=38A357916
• Prime numbersat n=6806