249001

Appears in sequences

• Squares such that digits of sqrt(n) appear in both n and n^(3/2).at n=29A029781
• a(n) = prime^2 and digits of prime appear in a(n).at n=9A030081
• Composite numbers whose prime factors have no digits other than 4's and 9's.at n=2A036319
• Numbers n such that sigma(d(n^3))==d(sigma(n^2)), where d(n) is the number of divisors of n.at n=33A063797
• Squares with internal digits also forming a square > 0.at n=20A069701
• Squares whose internal digits form a square.at n=36A077355
• Expansion of e.g.f.: exp(4*x/(1-x)) / sqrt(1-x^2).at n=6A202827
• After the initial 1, numbers k such that A347381 obtains its minimum value at k, of all the divisors d of k larger than one, where A347381 is the distance from n to the nearest common ancestor of n and sigma(n) in the Doudna-tree (A005940).at n=44A374218
• Numbers c such that a + b + c = d are abcd quadruples in the "abcd-conjecture" with a < b < c < d, all |a|, b, c, d are pairwise coprime, the quality q of the quadruple has q > 1, term a = +/- 1 = A376149(n) and term b = A376144(n) (with repetitions and sorted by c then b).at n=31A376143