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A077914
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Sums of two distinct primes in exactly two ways.
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8
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OFFSET
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1,1
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COMMENTS
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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
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LINKS
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Table of n, a(n) for n=1..9.
G. L. Honaker, Jr., Prime Curio for 16, April 2000.
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EXAMPLE
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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.
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MAPLE
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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
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CROSSREFS
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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
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KEYWORD
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nonn,more
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AUTHOR
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Shyam Sunder Gupta, Mar 29 2003
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STATUS
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approved
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