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(Python)
from sympy import divisors, isprime
def ok(n):
s = "".join(str(d) for d in divisors(n)[1:-1])
return s != "" and isprime(int(s))
print([k for k in range(319) if ok(k)]) # Michael S. Branicky, Oct 01 2024
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editing
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approved
proposed
reviewed
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proposed
Numbers n k with the property that the concatenation of the nontrivial divisors of n k (i.e., excluding 1 and nk) is a prime.
n k | divisors | concatenation
reviewed
editing
proposed
reviewed
editing
proposed