A167597 The isolated nonprimes that are the sum of two successive primes.

12, 18, 30, 42, 60, 138, 198, 240, 462, 600, 618, 810, 828, 882, 1230, 1290, 1320, 1428, 1482, 1620, 1668, 1722, 1878, 2088, 2112, 2688, 2970, 3330, 3390, 3768, 4002, 4092, 4242, 4260, 4482, 4518, 5100, 5280, 5418, 5502, 5520, 5652, 6090, 6198, 6300, 6450

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 07 2009

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A001043, A001097.

Programs

Maple

N:= 10000: # to get all terms <= N
Primes:= select(isprime, [seq(i,i=3..N+1,2)]):
A001043:= convert(Primes[1..-2] + Primes[2..-1],set):
Primes:= convert(Primes,set):
A:= map(`+`,Primes intersect map(`-`,Primes,2),1) intersect A001043:
sort(convert(A,list)); # Robert Israel, Jan 18 2016

Formula

A001043 INTERSECT A014574. [R. J. Mathar, May 30 2010]

Extensions

Corrected (60 inserted, 178 replaced by 198, 462 inserted....) by R. J. Mathar, May 30 2010