Composite numbers k such that sigma(k + 6!) = sigma(k + 720) = sigma(k) + 720.

Terms

a(0) =427a(1) =553a(2) =595a(3) =623a(4) =737a(5) =871a(6) =913a(7) =923a(8) =1199a(9) =1207a(10) =1241a(11) =1507a(12) =1582a(13) =1817a(14) =1848a(15) =2193a(16) =2226a(17) =2337a(18) =2398a(19) =2407a(20) =2553a(21) =2561a(22) =2728a(23) =2758a(24) =2929a(25) =3016a(26) =3115a(27) =3248a(28) =3346a(29) =3502