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A217265
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Numbers with 4 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime.
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4
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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
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..32.
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EXAMPLE
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21249 is 3*3*3*787. 333787, 337873, 378733 and 787333 are all prime, so 21249 is in the sequence.
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CROSSREFS
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Cf. A217263, A217264, A180679, A181559.
Sequence in context: A284915 A252165 A289674 * A345563 A345564 A345819
Adjacent sequences: A217262 A217263 A217264 * A217266 A217267 A217268
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KEYWORD
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nonn,base
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AUTHOR
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Dmitri Kamenetsky, Sep 29 2012
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STATUS
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approved
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