18223

Properties

Appears in sequences

• Number of one-sided chessboard polyominoes with n cells.at n=9A001071
• Primes of the form k^2 - 2.at n=33A028871
• Third member of a sexy prime quadruple: value of p+12 such that p, p+6, p+12 and p+18 are all prime.at n=33A046123
• a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048212.at n=28A048222
• Primes p from A031924 such that A052180(primepi(p)) = 11.at n=36A052232
• Third term of balanced prime quartets: p(m-1)-p(m-2) = p(m)-p(m-1) = p(m+1)-p(m).at n=13A054802
• Primes of the form sum 6d/(2 + mu(d)) for some k and all d dividing k.at n=32A069548
• Sums of groups in A075635.at n=30A075636
• Balanced primes of order four.at n=16A082079
• Primes that are 2 less than a perfect power m^k, k >= 2.at n=36A094786
• Numbers p such that p = (prime(n)+ prime(n+2))/2 is prime for prime indices n=2, 3, 5...at n=20A098038
• Primes of the form (prime(prime(k)) + prime(prime(k+1)))/2.at n=18A098042
• Records in A117677.at n=46A117679
• Left truncatable primes in base 9 (written in decimal form).at n=49A129945
• Primes of the form 88x^2+32xy+127y^2.at n=30A140630
• Primes congruent to 44 mod 53.at n=38A142574
• Primes congruent to 51 mod 59.at n=32A142778
• Primes congruent to 45 mod 61.at n=34A142843
• Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers.at n=34A176557
• Primes p such that p + d and p - d are primes, where d is the sum of floors of square roots of the digits of p.at n=40A179634