A263108 Semiprimes m such that the leftward cyclic permutation of its decimal digits is a larger semiprime.

15, 26, 39, 49, 58, 122, 129, 134, 141, 145, 155, 158, 159, 161, 177, 178, 183, 185, 187, 226, 254, 262, 298, 339, 341, 355, 358, 362, 371, 381, 391, 393, 394, 445, 451, 469, 473, 493, 497, 565, 581, 583, 586, 589, 674, 781, 791, 889, 895, 899, 1114, 1119

Offset: 1

Author

Zak Seidov, Oct 09 2015

Keywords

• nonn
• base

Comments

Subsequence of A263106.

Examples

			Permute the digits of 15 = 3 * 5 to get 51 = 3 * 17.
Permute the digits of 26 = 2 * 13 to get 62 = 2 * 31.
Permute the digits of 122 = 2 * 61 to get 221 = 13 * 17.
Permute the digits of 129 = 3 * 43 to get 291 = 3 * 97.
		

Links

• Zak Seidov, Table of n, a(n) for n = 1..28070 (all terms up to 10^6)

Crossrefs

Cf. A001292, A001358, A085751, A263106.

Programs

Mathematica

Select[Range[4, 1000000], 2 == PrimeOmega[#] == PrimeOmega[fd = FromDigits[RotateLeft[IntegerDigits[#]]]] && fd > # &] (* for b-file *)