26871

Appears in sequences

• Let r, s, t be three permutations of the set { 1, 2, 3, ..., n }; a(n) = minimal value of Sum_{i=1..n} r(i)*s(i)*t(i).at n=24A070735
• Odd composites (including 1 in the count) where the number 3 mod 4 equals the number 1 mod 4.at n=5A093181
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0001-1101-0111 pattern in any orientation.at n=11A147256
• G.f.: imaginary part of 1/(1 - i*x - i*x^2) where i=sqrt(-1).at n=39A201838
• Numbers n such that prime(n) + reversal(prime(n)) is a square.at n=16A227371
• Number of partitions of 4n into 4 parts.at n=38A238340
• Number of partitions of 6n into exactly 4 parts.at n=26A256328
• Number of compositions (ordered partitions) of n into distinct parts >= 4.at n=46A339102