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A347612
Semiprimes formed from single-digits primes only, each used at most once.
1
25, 35, 57, 235, 237, 253, 327, 527, 537, 573, 723, 753, 2537, 2573, 2735, 5327, 5723, 7235
OFFSET
1,1
EXAMPLE
527 is a semiprime and its non-repeating digits are primes.
MATHEMATICA
Select[FromDigits/@Flatten[Permutations/@Subsets[ {2, 3, 5, 7}], 1], PrimeOmega[ #] == 2&]//Union
CROSSREFS
KEYWORD
easy,base,fini,full,nonn
AUTHOR
Harvey P. Dale, Sep 08 2021
STATUS
approved