28905

Appears in sequences

• [ n(n-1)(n-2)(n-3)/17 ].at n=28A011927
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 68.at n=4A031746
• a(n) = 25*n^2 + 5.at n=33A158445
• a(n) = (prime(n))^2 - (nonprime(n))^2.at n=40A161757
• a(3n) = a(3n-1)+a(3n-2), a(3n+1) = a(3n)*a(3n-1), a(3n+2) = a(3n+1)/a(3n).at n=17A174529
• Squarefree numbers which yield zero when their prime factors are xored together.at n=15A235488
• Number of length 5 1..(n+1) arrays with every leading partial sum divisible by 2, 3 or 5.at n=9A254832
• Let P1>=3, P2, P3 be consecutive primes, with P3-P2=2. a(n)=(P2+P3)/12 when P2-P1 sets a record.at n=13A329158
• Let P1 >= 3, P2, P3 be consecutive primes, with P3 - P2 = 2. a(n) = (P2 + P3)/12 for the first occurrence of (P2 - P1)/2 = n.at n=34A329251
• 6*a(n) - 1 is the least prime p of a pair of twin primes p, p + 2, for which the prime gap immediately below p achieves the size 2*A007494(n).at n=22A337435