27672

Appears in sequences

• Palindromes with exactly 5 prime factors (counted with multiplicity).at n=37A046331
• Split positive integers into extending even groups and sum: 1+2, 3+4+5+6, 7+8+9+10+11+12, 13+14+15+16+17+18+19+20, ...at n=24A061317
• Palindromes with successive increasing difference: a(k)-a(k-1) > a(k+1)- a(k).at n=44A071250
• a(n) = 1728*n + 24.at n=15A157325
• Palindromes which are sums of two consecutive primes.at n=21A162571
• Number of 3X3 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.at n=10A187529
• Number T(n,k) of endofunctions f on [n] satisfying f^3(i) = i for all i in [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=41A245958
• Noncube integers n such that n^2 + 1 is the sum of 2 positive cubes.at n=13A267119
• Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), n>=0, max(0,floor(log_2(n))+1)<=k<=n, read by rows.at n=47A335919
• Irregular triangle read by rows: T(n,k) = number of k-sided polygons formed when connecting infinite lines between all vertices and all points that divide the sides of an equilateral triangle into n equal parts, for k = 3, 4, ..., max_k.at n=48A346446
• Palindromes that can be written in more than one way as the sum of two distinct palindromic primes.at n=13A356854
• Palindromes that can be written in more than one way as the sum of two palindromic primes.at n=15A356881