28741

Appears in sequences

• Centered icosahedral (or cuboctahedral) numbers, also crystal ball sequence for f.c.c. lattice.at n=20A005902
• Denominators of continued fraction convergents to sqrt(641).at n=10A042231
• Numbers whose base-13 representation has exactly 5 runs.at n=10A043660
• Number of peaks at height >1 in all skew Dyck paths of semilength n.at n=7A128748
• Sides of squares which are filled exactly (no holes, no overlaps) by the digits needed to write a subsequence of consecutive Fibonacci numbers, starting with 0.at n=17A158027
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x| = 2*|x-y| - |y-z|.at n=41A212578
• Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|<=|x-y|<=|y-z|.at n=18A212903
• a(n) = 25*n^2 + 15*n + 1021.at n=33A214732
• Odd composite integers m such that A087130(m) == 5 (mod m).at n=41A335671
• Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 5 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=5 and b=-1, respectively.at n=26A337628
• Number of n-step 4-dimensional nonnegative lattice walks starting at the origin and using steps that increment all components or decrement one component by 1.at n=8A346225
• Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes.at n=44A376352