57721

Appears in sequences

• Numbers n such that the sum of the prime factors of n equals the product of the digits of n.at n=37A067173
• n times n+9 gives the concatenation of two numbers m and m+8.at n=7A116347
• a(n) = n^3 - n^2 - 2*n + 1.at n=39A123972
• Decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma truncated to n places.at n=4A139260
• Numerator of floor(gamma*10^n)/10^n, where gamma=A001620 is the Euler-Mascheroni constant.at n=5A195606
• Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its horizontal and vertical neighbors by one or two.at n=3A265439
• Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and vertical neighbors by one or two.at n=3A265443
• T(n,k)=Number of nXk 0..n+k-2 arrays with upper left zero and lower right n+k-2 and each element differing from its horizontal and vertical neighbors by one or two.at n=24A265447
• Numbers whose arithmetic derivative is equal to the product of their digits.at n=11A266816
• Numbers k such that (44*10^k - 233)/9 is prime.at n=20A294128
• Numbers n for which A326073(n) is equal to abs(1+A326146(n)).at n=19A326074