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A360739
Semiprimes of the form k^2 + 2.
1
6, 38, 51, 123, 146, 291, 326, 731, 843, 1227, 1371, 1766, 1851, 2306, 2603, 2811, 2918, 3027, 3602, 4227, 4358, 4763, 5186, 5331, 5627, 6243, 6891, 7058, 7571, 8102, 8651, 9411, 13227, 14163, 15627, 17426, 17691, 18227, 18771, 19883, 20738, 22502, 23411, 24027
OFFSET
1,1
COMMENTS
A242330 gives the corresponding values of k.
FORMULA
a(n) = A242330(n)^2 + 2.
EXAMPLE
123 is a term because 11^2 + 2 = 123 = 3*41.
MATHEMATICA
Select[Range[0, 200]^2 + 2, PrimeOmega[#] == 2 &] (* Amiram Eldar, Feb 18 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Elmo R. Oliveira, Feb 18 2023
STATUS
approved