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 A085745 2^n + n is a semiprime. 4
 2, 11, 23, 34, 59, 69, 87, 95, 119, 123, 129, 171, 197, 239, 341, 425, 455, 471, 515, 519, 635, 765, 959, 1115, 1181, 1210 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a(n)=2k <=> A089535(n) is even <=> A089536(n)=2 <=> A089537(n)=4^k/2+k, and for any prime of this form, there is a term a(n)=2k in this sequence. - M. F. Hasler, Oct 08 2009 MATHEMATICA Select[Range[1300], PrimeOmega[2^#+#]==2&] (* Harvey P. Dale, Dec 18 2014 *) CROSSREFS Cf. A089535, A089536, A089537. Sequences A165767, A165768, A165769 are the analog for 2^n-n. - M. F. Hasler, Oct 08 2009 Sequence in context: A158189 A218255 A256481 * A106856 A045387 A103255 Adjacent sequences:  A085742 A085743 A085744 * A085746 A085747 A085748 KEYWORD more,nonn AUTHOR Jason Earls, Jul 21 2003 EXTENSIONS More terms from Ray Chandler, Nov 08 2003 341 from Donovan Johnson, Mar 06 2008 More terms from Sean A. Irvine, Oct 27 2009 STATUS approved

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Last modified June 24 13:17 EDT 2019. Contains 324325 sequences. (Running on oeis4.)