Numbers m such that sigma(m+1)+sigma(m-1) = 5*phi(m).

Terms

a(0) =2a(1) =3a(2) =4a(3) =32a(4) =58a(5) =133a(6) =221a(7) =377a(8) =407a(9) =472a(10) =1241a(11) =1978a(12) =7232a(13) =13181a(14) =13952a(15) =15323a(16) =15409a(17) =17362a(18) =22328a(19) =32048a(20) =44215a(21) =46192a(22) =46498a(23) =46975a(24) =49228a(25) =73169a(26) =74498a(27) =128723a(28) =177305a(29) =241828