47800

Appears in sequences

• a(n) is the sum of squares of the first n positive integers congruent to 2 mod 3.at n=24A024394
• If n mod 2 = 0 then a(n) = n^4/4 - 2*n^2 + 3*n; otherwise, a(n) = n^4/4 - 2*n^2 + 3*n - 5/4.at n=21A064835
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=45A136906
• a(n) = [x^n] 1/(1+n*x) * Product_{j=2..n} 1/(1-x^j).at n=6A292567
• Numbers k such that 337*2^k+1 is prime.at n=22A322961