27872

Appears in sequences

• Expansion of (3+2*x^2)/(1-x)^4.at n=31A037236
• Palindromic numbers which are the difference of two positive cubes.at n=5A038808
• Palindromes with exactly 7 prime factors (counted with multiplicity).at n=0A046333
• Numbers n such that there are exactly 4 primes p such that floor(n*log(n))+1<=p<=floor((n+1)*log(n+1))-1.at n=5A068362
• Smallest palindrome with exactly n prime factors (counted with multiplicity).at n=7A076886
• a(1) = 1; a palindrome is included in the sequence if it has a prime signature that is different from all previous terms.at n=26A083433
• Palindromes with distinct prime signatures that occur naturally. Smallest palindrome with a prime signature of A025487(n), or 0 if no such number exists.at n=30A083435
• Numbers n such that n and its digit reversal R(n) both are difference of positive cubes.at n=27A109879
• Biquadrateful (i.e., not biquadrate-free) palindromes.at n=19A133514
• Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric under horizontal reflection.at n=7A143871
• Number of spanning trees in G X P_n, where G = {{1, 2}, {1, 3}, {1, 4}, {2, 5}}.at n=2A167070
• Number of strings of numbers x(i=1..6) in 0..n with sum i^2*x(i)^2 equal to n^2*36.at n=37A184244
• Number of (n+3) X 5 0..1 matrices with each 4 X 4 subblock idempotent.at n=17A224562
• a(n) = A000203(A251720(n)).at n=9A268733
• Sum of first n Honaker primes.at n=17A276255
• G.f.: (1 + x/(1 + x^2/(1 + x^3/(1 + x^4/(1 + ...))))) / (1 - x/(1 - x^2/(1 - x^3/(1 - x^4/(1 - ...))))), a continued fraction.at n=20A285636
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + 2*b(n-1) + b(n-2), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A294561
• Minimal number of moves for the cyclic variant of Hanoi's tower for 4 pegs and n disks, with the final peg three steps away.at n=15A338089
• Triangle read by rows: T(n,k) is the number of permutations of the cyclic group Z/nZ whose longest embedded arithmetic progression has length k.at n=31A339942
• Palindromes that can be written in more than one way as the sum of two distinct palindromic primes.at n=15A356854