A077914 Sums of two distinct primes in exactly two ways.

16, 18, 20, 22, 26, 28, 32, 62, 68

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

Table of n, a(n) for n=1..9.

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.

Crossrefs

Cf. A077969 (3 ways), A078299 (4 ways), A080854 (5 ways), A080862 (6 ways).

Sequence in context: A374594 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