Numbers k such that k! contains k as a string of digits.

Terms

a(0) =1a(1) =2a(2) =4a(3) =20a(4) =21a(5) =26a(6) =30a(7) =33a(8) =37a(9) =39a(10) =42a(11) =44a(12) =45a(13) =48a(14) =51a(15) =52a(16) =53a(17) =56a(18) =59a(19) =60a(20) =64a(21) =65a(22) =67a(23) =68a(24) =69a(25) =72a(26) =75a(27) =78a(28) =79a(29) =80