28009

Appears in sequences

• Numerators of central difference coefficients M_{3}^(2n+1).at n=8A002673
• Pseudoprimes to base 3.at n=38A005935
• Strong pseudoprimes to base 9.at n=27A020235
• Strong pseudoprimes to base 28.at n=13A020254
• Strong pseudoprimes to base 29.at n=17A020255
• Strong pseudoprimes to base 55.at n=13A020281
• Strong pseudoprimes to base 81.at n=38A020307
• Strong pseudoprimes to base 87.at n=19A020313
• a(n)-th prime is sum of first k primes for some k.at n=31A020641
• Base-3 Euler-Jacobi pseudoprimes.at n=18A048950
• Numbers n such that 289*2^n-1 is prime.at n=20A050903
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=2, I={0,1}.at n=35A080013
• Scale factor by which primitive Pythagorean triangle {x=A088509(n), y=A088510(n), z=A088511(n)} needs be enlarged in order to circumscribe the smallest integral square having a side on the hypotenuse.at n=26A088544
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 0, -1), (1, 0, 0), (1, 1, 1)}.at n=8A150381
• Terms of A122780 which are not Carmichael numbers A002997.at n=37A153514
• A121153 \ A005836.at n=14A170830
• Primitive numbers n such that 1/n is in the Cantor set.at n=32A173793
• Wiener index of the n-sunlet graph.at n=34A180574
• Number of nX2 0..5 arrays with values 0..5 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=6A198621
• Number of nX7 0..5 arrays with values 0..5 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=1A198626