A347612 Semiprimes formed from single-digits primes only, each used at most once.

25, 35, 57, 235, 237, 253, 327, 527, 537, 573, 723, 753, 2537, 2573, 2735, 5327, 5723, 7235

Offset

1,1

Links

Table of n, a(n) for n=1..18.

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

Cf. A177061, A000040, A168349, A168385.

Sequence in context: A173251 A063149 A046423 * A331808 A153446 A039457

Adjacent sequences: A347609 A347610 A347611 * A347613 A347614 A347615

Keyword

easy,base,fini,full,nonn

Author

Harvey P. Dale, Sep 08 2021

Status

approved