55931

Properties

Appears in sequences

• Primes p of the form k*(k + 1) - 1 such that p and p + 2 are twin primes.at n=31A088486
• a(0) = 1, a(n) = 1 + 2*3 + 4*5 + 6*7 + ... + (2n)*(2n+1) for n > 0.at n=34A098931
• Primes p such that p + 2, 18*p^2 + 1, and 18*(p+2)^2 + 1 are all primes.at n=17A115272
• Expansion of (1-4x+12x^2-16x^3+8x^4)/(1-x)^5.at n=35A119327
• Smallest of four consecutive primes whose average is a triangular number.at n=28A226155
• Lesser of twin primes for which phi(p-1) < phi(p+1).at n=13A286715
• Primes p such that q^2 - p^2 + 1 is the square of a composite number where p and q are consecutive primes.at n=41A316934
• Prime numbersat n=5678