A217265 Numbers with 4 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime.

21249, 33271, 89937, 146461, 147833, 148519, 164297, 175257, 211631, 216953, 234269, 254849, 261023, 269941, 311229, 318033, 348823, 377001, 390447, 520209, 561491, 848239, 941679, 943679, 957447, 960957, 1012879, 1110159, 1221431, 1410399, 1525203, 1681729

Offset: 1

Author

Dmitri Kamenetsky, Sep 29 2012

Keywords

• nonn
• base

Examples

			21249 is 3*3*3*787. 333787, 337873, 378733 and 787333 are all prime, so 21249 is in the sequence.
		

Crossrefs

Cf. A217263, A217264, A180679, A181559.