Terms k of A002977 such that both (k-1)/2 and (k-1)/3 are also terms of A002977.

Terms

a(0) =31a(1) =175a(2) =1039a(3) =1471a(4) =2191a(5) =4495a(6) =6223a(7) =8815a(8) =13135a(9) =20479a(10) =22639a(11) =26815a(12) =30703a(13) =36031a(14) =37327a(15) =45967a(16) =52879a(17) =53743a(18) =54031a(19) =66703a(20) =78799a(21) =89023a(22) =108175a(23) =122863a(24) =125887a(25) =132799a(26) =135679a(27) =136687a(28) =160879a(29) =177151