27311

Appears in sequences

• a(1) = 3; for n>0, a(n+1) = a(n) + floor((a(n)-1)/2).at n=24A003312
• Squarefree conductors of quintic fields.at n=19A085715
• a(n) = (5/6)*n^3+(5/2)*n^2+(8/3)*n.at n=31A092185
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.at n=12A146133
• Numbers k such that k^p-p is prime, where p is product of the digits of k.at n=23A178328
• Pisot sequences L(6,15), S(6,15).at n=9A277089
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+27298) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=16A283888
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+27298) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=18A283888
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+27298) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=33A283888