25472

Appears in sequences

• Number of primitive n-bead necklaces (turning over is allowed) where complements are equivalent.at n=21A000046
• Number of primitive (period n) bracelet structures using exactly two different colored beads.at n=20A056366
• First subsequent, disjoint occurrence of n consecutive nonprimes.at n=39A060064
• Triangle of T(n,k) where T(n,k)/(n-1)! is probability of player k out of n players winning a game of "Elimination": rules are that player 1 chooses one of the others at random to be eliminated, then player 2 (or 3 if player 2 has been eliminated) chooses somebody else at random from the survivors to be eliminated next, then the next surviving player chooses and so on round the circle until all but one have been eliminated.at n=50A071818
• a(n) = ((2+sqrt(5))*(1+sqrt(5))^n + (2-sqrt(5))*(1-sqrt(5))^n)/2.at n=8A162770
• Number of arrangements of 4 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.at n=32A188250
• Number of (4+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=10A252536
• a(n) is the least k such that A295520(k) = n.at n=51A295793
• Greater of a pair of amicable numbers k < m such that s(k) = m and s(m) = k, where s(k) = A162296(k) - k is the sum of aliquot divisors of k that have a square factor.at n=3A357496
• The internal state of the Sinclair ZX81 and Spectrum random number generator.at n=9A357907
• Smallest integer that is the sum of a prime and the square of a prime in n or more ways.at n=28A381333
• Smallest integer that is the sum of a prime and the square of a prime in exactly n ways.at n=28A381334