Numbers k such that k and k+2 have the same deficiency (A033879).

Terms

a(0) =2a(1) =6497a(2) =12317a(3) =91610a(4) =133787a(5) =181427a(6) =404471a(7) =439097a(8) =485237a(9) =1410119a(10) =2696807a(11) =6220607a(12) =6827369a(13) =6954767a(14) =9770027a(15) =10302419a(16) =10449347a(17) =10887977a(18) =11014007a(19) =16745387a(20) =18959111a(21) =25883519a(22) =27334469a(23) =39508037a(24) =40311149a(25) =40551617a(26) =42561437a(27) =44592209a(28) =47717471a(29) =48912107