97840

Appears in sequences

• a(n) is least k such that k and 10k are anagrams in base n (written in base 10).at n=30A023102
• Numbers k such that k+1, k+3, k+7 and k+9 are all primes.at n=36A125855
• a(n) = Sum_{k=0..n} binomial(2*k,k)/(k+1)*binomial(2*n-1,n-k).at n=8A279013
• Irregular table read by rows: Take a diagonal-edged (or diamond-shaped) checkerboard with all diagonals drawn, as in A333434. Then T(n,k) = number of k-sided polygons in that figure for k >= 3.at n=38A333458
• Positions of powerful terms among the numbers satisfying Euler's condition for odd perfect numbers (A228058).at n=22A388279