31991

Properties

Appears in sequences

• Primes prime(k) such that prime(k)*k falls between twin primes.at n=22A080174
• Partial sums of Catalan numbers A000108 multiplied by powers of -7.at n=4A113266
• a(n) = A001672(n) - A115239(n).at n=10A115240
• Palindromic primes in base 8 which are also emirps (A006567) in base 10.at n=14A168110
• Primes p such that (p+18), (p+36) and (p+72) are also prime.at n=33A175158
• Primes of the form 4*n^3-9.at n=5A200734
• Primes of the form 5n^2 - 9.at n=14A201790
• Convolution of primes with odd primes.at n=25A209403
• Emirps whose internal digits are also an emirp.at n=31A225235
• Primes that can be generated by the concatenation in base 7, in descending order, of two consecutive integers read in base 10.at n=25A287309
• Number of decagons that can be formed with perimeter n.at n=45A288256
• Prime numbersat n=3432