57584

Appears in sequences

• Numbers k such that phi(k) = phi(k+1).at n=31A001274
• Numbers k such that the multiplicative group of residues prime to k, M_k, is isomorphic to M_{k+1}.at n=8A003276
• Triangle of rooted planar maps, read by rows.at n=58A046652
• a(n) = 225*n^2 - n.at n=15A156813
• a(n) = 64*n^2 - 16.at n=29A157913
• a(n) = 900*n^2 - 2*n.at n=7A158408
• a(n) = 256*n^2 - 16.at n=14A158562
• Numbers k such that lambda(k) = lambda(k+1).at n=41A173695
• Numbers equal to the sum of their aliquot parts, each of them decreased by 8.at n=3A304284
• Primitive abundant numbers version 2 (abundant numbers all of whose proper divisors are deficient numbers) and increasing any prime factor in the prime factorization gives a non-abundant number when factored back.at n=41A335557