23827

Properties

Appears in sequences

• a(n)=(-1)^n(1 - (1/12)n(n + 1)(12 - n + n^2)).at n=23A080275
• Primes that are a concatenation of 2, 3 and a prime.at n=27A101218
• Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree.at n=12A153215
• a(n) = 66*n^2 + 1.at n=19A158689
• Primes p such that 2p + 3, 4p + 9, 3p + 2 and 9p + 8 are also primes.at n=14A176619
• G.f.: Product_{k>=1, j>=1} 1/((1 + x^(k*j)) * (1 - x^(k*j))^2).at n=18A320245
• Numbers that are the sum of seven fourth powers in seven or more ways.at n=17A345573
• Numbers that are the sum of seven fourth powers in exactly seven ways.at n=9A345829
• Prime numbers of the form A385986(1) + ... + A385986(k) for some k > 0.at n=31A385987
• Prime numbersat n=2650