26112

Appears in sequences

• Expansion of (1+2*x) / (1-2*x)^4.at n=7A014483
• Number of reversible strings with n-1 beads of 2 colors. 4 beads are black. String is not palindromic.at n=30A032091
• Number of monic irreducible polynomials over GF(4) with zero trace.at n=9A054661
• Numbers k such that sopf(k) = d(k) where d(k) = A001223(k) and sopf(k) = A008472(k).at n=36A064010
• a(n) = phi(n^3 + n^2 + n + 1).at n=38A066792
• Number of pentagonal regions in regular n-gon with all diagonals drawn.at n=43A067152
• Smallest k-almost prime between twin primes (for k >= 2).at n=9A068525
• 11-almost primes (generalization of semiprimes).at n=28A069272
• Solutions to phi(gpf(x)) - gpf(phi(x)) = 14 = c are special multiples of 17, x = 17k, where greatest prime factors of factor k were observed from {2, 3, 5}, i.e., it is smaller than 17. See solutions to other even cases of c (=A070813): A007283 for 0, A070004 for 2, A070815 for 254, A070816 for 65534. Gpf = greatest prime factor.at n=36A070814
• Duplicate of A054661.at n=9A074024
• Sums of the squares of the elements in the subsets of the integers 1 to n.at n=8A087076
• Number of genus 2, degree n, simply ramified covers of an elliptic curve.at n=15A170991
• Number of permutations p on the set [n] with the properties that abs(p(i)-i) <= 3 for all i, p(1) <= 2, and p(j) >= 2 for j=3,4.at n=11A188498
• Expansion of (phi(x) / f(-x^4))^4 in powers of x where phi(), f() are Ramanujan theta functions.at n=22A227175
• Irregular triangle read by rows: normalized dimensions of certain generalized quadratic residue codes of length n.at n=43A287879
• p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S^2)^3.at n=12A291013
• Even integers k such that lambda(sum of even divisors of k) = sum of odd divisors of k.at n=34A293356
• Anagraprod Integers. Integers N that reproduce their multiset of digits when all the products of two successive digits of N are done (and considered together).at n=64A296451
• Expansion of Product_{k>=1} (1 + 2^(k-1)*x^k).at n=13A304961
• Number of preimages of 321-avoiding permutations of [n] under West's stack-sorting map.at n=7A319027