Heptagonal numbers A000566 which are the sum of two other heptagonal numbers > 0.

Terms

a(0) =697a(1) =3186a(2) =3744a(3) =5221a(4) =7209a(5) =8323a(6) =12496a(7) =12852a(8) =19228a(9) =20566a(10) =21022a(11) =24850a(12) =29539a(13) =35224a(14) =38254a(15) =40768a(16) =44023a(17) =44689a(18) =52345a(19) =53802a(20) =58293a(21) =62173a(22) =63760a(23) =66178a(24) =67815a(25) =78057a(26) =79834a(27) =80730a(28) =82537a(29) =95746