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A257473
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Composite numbers whose digits appear in their prime factors.
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0
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22, 33, 55, 77, 95, 122, 132, 155, 202, 222, 272, 303, 312, 322, 326, 332, 333, 344, 366, 399, 505, 515, 555, 707, 731, 735, 777, 912, 955, 973, 995, 1010, 1030, 1070, 1090, 1111, 1112, 1122, 1131, 1133, 1155, 1173, 1177, 1192, 1197, 1199, 1202, 1212, 1222
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OFFSET
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1,1
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LINKS
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EXAMPLE
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See the link.
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PROG
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(PARI) is(n)=!isprime(n)&&n>1&&!#setminus(Set(digits(n)), Set(concat(apply(f->digits(f), factor(n)[, 1]~)))) \\ M. F. Hasler, May 08 2015
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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