A115711 Squares whose digit reversal is a semiprime (A001358).

4, 9, 49, 64, 121, 169, 289, 400, 625, 900, 961, 1156, 1225, 1849, 2401, 3136, 3364, 3481, 3721, 4900, 5041, 5329, 6400, 6889, 7396, 9604, 10201, 10816, 11449, 11881, 12100, 12544, 12769, 13225, 13456, 13924, 15376, 15625, 16129, 16384, 16900

Offset: 1

Author

Giovanni Resta, Jan 31 2006

Keywords

• nonn
• base

Examples

			64=8^2 and 46=2*23 is semiprime.
		

Crossrefs

Cf. A001358, A115710.

Programs

Mathematica

Select[Range[150]^2,PrimeOmega[FromDigits[Reverse[ IntegerDigits[ #]]]]==2&] (* Harvey P. Dale, Sep 20 2011 *)