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 A077914 Sums of two distinct primes in exactly two ways. 8
 16, 18, 20, 22, 26, 28, 32, 62, 68 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Most likely no more terms. See A117929. - T. D. Noe, Mar 21 2012 Numbers k such that A117929(k) = 2. - Joerg Arndt, Jun 07 2021 LINKS G. L. Honaker, Jr., Prime Curio for 16, April 2000. EXAMPLE 22 is a term as 22 = 19+3 = 17+5 are the only two ways to express 22 as a sum of two distinct primes. MAPLE P:=proc(q, w) local a, k, n; for n from 1 to q do a:=0; for k from 1 to trunc(n/2) do if isprime(k) and isprime(n-k) and n<>2*k then a:=a+1; fi; od; if a=w then print(n); fi; od; end: P(100, 2); # Paolo P. Lava, May 21 2014 CROSSREFS Cf. A077969 (3 ways), A078299 (4 ways), A080854 (5 ways), A080862 (6 ways). Sequence in context: A043705 A178980 A031315 * A273543 A274127 A328736 Adjacent sequences:  A077911 A077912 A077913 * A077915 A077916 A077917 KEYWORD nonn,more AUTHOR Shyam Sunder Gupta, Mar 29 2003 STATUS approved

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Last modified August 10 06:08 EDT 2022. Contains 356029 sequences. (Running on oeis4.)