28410

Appears in sequences

• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,13.at n=13A064243
• a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes.at n=22A103741
• Number of ways to place n nonattacking composite pieces queen + rider[2,3] on an n X n chessboard.at n=16A189876
• Number of partitions of n having standard deviation σ > 3.at n=41A238655
• Number of partitions p of n such that (number of numbers in p of form 3k) < (number of numbers in p of form 3k+1).at n=42A241743
• Number of length 1+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third.at n=29A248462
• Numbers m such that psi(x) = phi(m) has a solution while sigma(y) = phi(m) has none.at n=27A291524
• Inverse Euler transform of n^2.at n=19A316152
• a(n) is the sum of the digits of all positive integers k <= 2^n.at n=11A319733
• a(n) = Sum_{k=0..floor(3*n/17)} binomial(3*n-16*k,k).at n=30A392352