121727

Properties

Appears in sequences

• Number of monomials in expansion of determinant of an n X n Hankel matrix [ t(i+j) ] in terms of its entries.at n=10A019448
• a(n) = T(n,n) + T(n,m+1) + ... + T(n,n), where m=[ (n+2)/2 ], T given by A027011.at n=15A027021
• Primes in which the frequency of every digit is the same and is at least 2.at n=11A087395
• Primes p such that (p^512 + 1)/2 is prime.at n=28A341264
• Primes p such that (p mod s) and (p mod t) are consecutive primes, where s is the sum of the digits of p and t is the product of the digits of p.at n=35A344127
• Emirps that can be written as p*q+p+q where p and q are emirps.at n=31A352249
• Prime numbersat n=11457