Numbers k such that tau(k+1) - tau(k) = 3, where tau(k) = the number of divisors of k (A000005).

Terms

a(0) =49a(1) =99a(2) =1023a(3) =1681a(4) =1935a(5) =2499a(6) =8649a(7) =9603a(8) =20449a(9) =21903a(10) =23715a(11) =29583a(12) =30975a(13) =38024a(14) =43263a(15) =58563a(16) =60515a(17) =71824a(18) =74528a(19) =110223a(20) =130321a(21) =136899a(22) =145924a(23) =150543a(24) =154449a(25) =165649a(26) =181475a(27) =216224a(28) =224675a(29) =233288