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 A231903 Even numbers which are the sum of two different primes > 3 in exactly one way. 0
 12, 16, 20, 22, 26, 32, 38, 62 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Conjecture: there are no more numbers > 62 in the sequence. Remark that the two primes are one of a twin primes pair and a pair of twin primes for 12=5+7. The pairs of primes are : 12=5+7, 16=5+11, 20=7+13, 22=5+17, 26=7+19, 32=13+19, 38=7+31, 62=19+43. LINKS EXAMPLE 10=3+7=5+5 not in the sequence (not >3 or not different), 12=5+7, 12 first in the sequence, 14=3+11=7+7 not in the sequence. PROG (PARI) is_A231903(n)={my(s=0); forprime(p=5, n\2-1, isprime(n-p)&&s++>1&&return); s} \\ - M. F. Hasler, Nov 22 2013 CROSSREFS Cf. A007534 Sequence in context: A171955 A225071 A210577 * A243538 A183052 A240052 Adjacent sequences:  A231900 A231901 A231902 * A231904 A231905 A231906 KEYWORD nonn AUTHOR Pierre CAMI, Nov 15 2013 EXTENSIONS Missing term a(7)=38 added by M. F. Hasler, Nov 22 2013 STATUS approved

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Last modified May 19 20:41 EDT 2019. Contains 323410 sequences. (Running on oeis4.)