3,1

Related to Lemoine's conjecture, which states that all odd integers > 5 can be represented as 2*p+q, p, q primes.

See A002091.

Hugo Pfoertner, Table of n, a(n) for n = 3..10000

Wikipedia, Lemoine's conjecture

a(3)=2 because 2*3+1=7=2*2+3; a(4)=2: 2*3+1=9=2*2+5; a(5)=2: 11=2*2+7; a(6)=3: 13=2*3+7.

Cf. A002091, A103506 (smallest q), A046927, A195353 (positions of records), A195354 (records), A103153 (prime p=2 excluded), A185091.

Sequence in context: A173883 A022922 A239141 * A103507 A219252 A290839

Adjacent sequences: A195349 A195350 A195351 * A195353 A195354 A195355

nonn

Hugo Pfoertner, Sep 16 2011

approved