18471

Appears in sequences

• Quasi-Carmichael numbers to base -9: squarefree composites n such that prime p|n ==> p+9|n+9.at n=2A029569
• Values of Newton-Gregory forward interpolating polynomial (1/3)*(2*n-7)*(2*n^2-11*n+18).at n=27A030434
• Values of Newton-Gregory forward interpolating polynomial (1/3)*(2*n - 3)*(2*n^2 - 3*n + 4).at n=25A030441
• Numbers n for which there are exactly eight k such that n = k + reverse(k).at n=39A072432
• Satisfies A^3 = BINOMIAL(A090358^2), where A090358^6 = BINOMIAL(A090358^5).at n=5A090360
• Numbers k such that k and k^2 use only the digits 1, 3, 4, 7 and 8.at n=7A137028
• Numbers that are the product of 3 distinct primes a,b and c, such that a+b+c, a^2+b^2+c^2 and a^3+b^3+c^3 are prime numbers.at n=22A176911
• Expansion of Product_{k=1..9} (1+x^(2*k-1))/(1-x^(2*k)).at n=52A316721
• Admirable totient numbers: numbers that are equal to the sum of their iterated phi, with one of them taken with a minus sign.at n=45A335121
• a(n) = n * Sum_{d|n} binomial(d+2,3)/d.at n=46A343544
• Row sums of the triangular array A357431.at n=41A357417
• Number of nonisomorphic magmas with n elements satisfying the equations (xy)y = x and x(yz) = xy.at n=8A362642