A372848 Taxicab numbers that are sandwiched between semiprimes.

4104, 171288, 1728216, 2864288, 2987712, 2991816, 3512808, 3551112, 9016488, 10424232, 12753160, 13825728, 14197248, 36047592, 43450344, 43699392, 49844032, 63057960, 72131904, 75550088, 85188096, 92384712, 107872128, 107919000, 110808000, 117258678, 119824488, 132678000

Offset: 1

Author

Massimo Kofler, May 16 2024

Keywords

• nonn

Comments

All terms are even numbers.

Examples

			4104 = 2^3 * 3^3 * 19 (between 4103 = 11 * 373 and 4105 = 5 * 821).
171288 = 2^3 * 3^3 * 13 * 61 (between 171287 = 157 * 1091 and 171289 = 103 * 1663).
1728216 = 2^3 * 3^5 * 7 * 127 (between 1728215 = 5 * 345643 and 1728217 = 617 * 2801).
		

Crossrefs

Cf. A001235, A001358.

Subsequence of A371602.

Programs

Mathematica

Select[Import["https://oeis.org/A001235/b001235.txt", "Table"][[;; , 2]], # < 1.5*10^8 && PrimeOmega[# + {-1, 1}] == {2, 2} &] (* Amiram Eldar, May 16 2024 *)