84181

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 64.at n=1A031652
• Primes in A005891 = Centered pentagonal numbers: (5n^2 + 5n + 2)/2.at n=29A145838
• Primes of the form n^2 + 81.at n=27A256775
• Primes having only {1, 4, 8} as digits.at n=21A260270
• Primes in A284798.at n=17A372770
• Prime numbersat n=8206