A380992 Powers of two which produce a prime number when their digits are reversed.

2, 16, 32, 128, 1024, 131072, 16777216, 137438953472, 35184372088832, 36028797018963968, 1180591620717411303424, 151115727451828646838272, 162259276829213363391578010288128, 174224571863520493293247799005065324265472, 1427247692705959881058285969449495136382746624

Offset: 1

Author

Paul Duckett, Feb 11 2025

Keywords

• nonn
• base

Comments

A057708 is the main entry for this question. - N. J. A. Sloane, Feb 28 2025

Examples

			The digits of 1024 (2^10) reverse to form the prime number 4201.
		

Crossrefs

Cf. A057708.

Programs

Mathematica

Select[2^Range[200],PrimeQ[IntegerReverse[#]]&] (* James C. McMahon, Feb 28 2025 *)

Formula

a(n) = 2^A057708(n). - Pontus von Brömssen, Feb 11 2025