41004

Appears in sequences

• a(n) = (5*n+1)*(5*n+4).at n=40A001545
• Number of connected triangle-free planar graphs with n nodes.at n=10A049368
• a(n) = 18*(n - 2)*(2*n - 5).at n=34A060787
• Numbers k that divide the sum of the digits of 2^k * k!.at n=28A108861
• Numbers with no 1's in their base-3, base-4, and base-5 expansions. Intersection of A005823, A023709, and A023725.at n=12A117482
• Numbers k such that k^2 divides 3*Fibonacci(k).at n=8A130164
• Numbers whose square is the product of a number and its reverse.at n=17A207373
• a(n) = number of ordered triples (w,x,y) such that w,x,y are all in {0,...,n} and the numbers |w-x|, |x-y|, |y-w| are distinct.at n=35A212963
• Positive integers n such that n=p+q for some primes p,q with pi(p)*pi(q) = sigma(n).at n=32A273286
• Non-palindromes numbers not ending in 0 whose square is the product of a number and its reverse in only one way.at n=9A325151
• G.f. satisfies A(x) = 1 + x*A(x)/(1 - x^4*A(x)^3).at n=17A365245
• Expansion of (1/x) * Series_Reversion( x / (1-x) * (1-x-x^2)^2 ).at n=8A369486