22850

Appears in sequences

• Irregular square reversible numbers. Numbers which when squared and written backwards give a square again, but don't satisfy reverse(n^2) = reverse(n)^2.at n=21A129914
• Beach-Williams Pell numbers of type 2pqr (p,q,r primes).at n=2A212076
• Numbers that cannot be expressed as the sum of one or more numbers without any repeated digits.at n=32A342080
• T(n,k) is the number of permutations of [n] having exactly k pairs of integers i<j in [n] such that their cycle minima have opposite sorting order; triangle T(n,k), n>=0, 0<=k<=A125811(n)-1, read by rows.at n=57A381529