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A089535
Semiprimes of the form 2^k + k.
4
6, 2059, 8388631, 17179869218, 576460752303423547, 590295810358705651781, 154742504910672534362390615, 39614081257132168796771975263, 664613997892457936451903530140172407, 10633823966279326983230456482242756731, 680564733841876926926749214863536423041
OFFSET
1,1
LINKS
FORMULA
a(n) = 2^A085745(n) + A085745(n).
MATHEMATICA
Select[Table[2^k+k, {k, 200}], PrimeOmega[#]==2&] (* Harvey P. Dale, Aug 11 2024 *)
CROSSREFS
Intersection of A001358 and A006127.
Cf. A085745, A089536, A089537, 129962.
Sequence in context: A209520 A279440 A004817 * A059081 A373235 A226461
KEYWORD
nonn
AUTHOR
Ray Chandler, Nov 08 2003
EXTENSIONS
a(10)-a(11) from Jinyuan Wang, Jul 30 2021
STATUS
approved