27885

Appears in sequences

• Distinct odd numbers in (2,3)-Pascal triangle A029600.at n=52A029608
• Odd numbers to the left of the central elements of the (2,3)-Pascal triangle A029600.at n=35A029612
• Numbers to right of central elements of the (3,2)-Pascal triangle A029618 that are different from 2.at n=49A029633
• Odd numbers to right of central elements of the (3,2)-Pascal triangle A029618.at n=29A029634
• Numerators of continued fraction convergents to sqrt(569).at n=7A042090
• The sequence e when b=[ 1,0,1,1,1,... ].at n=44A042953
• Numbers k such that k | sigma_6(k) + phi(k)^6.at n=17A055700
• Numbers k that can be expressed as k = w + x = y*z with w*x = y^3 + z^3 where w, x, y, and z are all positive integers.at n=38A057372
• a(n) = (Sum_{k=1..n} A073698(k))^(1/n).at n=39A093928
• Numbers k such that k and k^2 use only the digits 2, 3, 5, 7 and 8.at n=7A137083
• a(n) = (8*n+5)*(8*n+9).at n=20A146302
• Quintisection A061037(5*n+2).at n=33A165248
• a(n) = prime(n)^2-4.at n=38A166010
• 13 times hexagonal numbers: a(n) = 13*n*(2*n-1).at n=33A194713
• a(n) = smallest k having at least four prime divisors d such that (d + n) | (k + n).at n=2A202159
• Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.at n=9A260495
• Numbers n such that the decimal digits of n^2 are all prime.at n=18A275971
• Triangle T read by rows: T(n, m), for n >= 2, and m=1, 2, ..., n-1, equals the positive integer solution x of y^2 = x^3 - A(n, m)^2*x with the area A(n, m) = A249869(n, m) of the primitive Pythagorean triangle characterized by (n, m) or 0 if no such triangle exists.at n=67A278711