A260046 Composites whose prime factorization in base 2 is an anagram of the number in base 2.

25, 159, 175, 242, 245, 287, 303, 319, 459, 500, 575, 591, 623, 679, 687, 699, 735, 763, 1135, 1167, 1203, 1243, 1247, 1271, 1351, 1371, 1391, 1525, 1631, 1734, 1911, 2167, 2173, 2231, 2285, 2295, 2319, 2359, 2463, 2471, 2495, 2519, 2743, 2779, 2787, 2863, 2890

Offset: 1

Author

Stephen Tucker, Jul 14 2015

Keywords

• base
• easy
• nonn

Examples

			25 = 5^2. In base 2, 11001 = 101^10.
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A260047, A260048, A260049, A260050, A260051, A260052, A260053, A025283, A260054, A260055.

Programs

Mathematica

Select[Range[10^6], !PrimeQ[#] && Sort@ IntegerDigits[#, 2] == Sort@ Flatten@ IntegerDigits[ Select[ Flatten@ FactorInteger@ #, #>1 &], 2] &] (* Giovanni Resta, Jul 14 2015 *)