54546

Appears in sequences

• Numbers k such that k*(k+3) gives the concatenation of a number m with itself.at n=10A116287
• Let n be the number whose square n^2 has the decimal expansion { d(1) d(2) ... d(D) }, and let q be the corresponding number whose decimal expansion is { d(2) d(3) ... d(D) d(1)}. Sequence lists numbers n dividing q.at n=45A177928
• E.g.f. A(x) satisfies A(x) = (x + 2*exp(A(x)) - 2)/3.at n=5A201465
• a(n) is the total number of pentagrams in a variant of pentagram fractal after n iterations.at n=16A263418
• Numbers k with a prime factor other than 2 or 5 such that digsum(k) = digsum(repeating period of 1/k).at n=34A390294