1003440

Appears in sequences

• Positive numbers k such that k and 4*k are anagrams in base 5 (written in base 5).at n=26A023063
• a(n) = Fibonacci(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the theta series of direct sum of 2 copies of hexagonal lattice.at n=19A205967