a(n) = Least integer k such that A249431(k) = n, and -1 if no such integer exists.

Terms

a(0) =1a(1) =0a(2) =350a(3) =439a(4) =174a(5) =713a(6) =323a(7) =1923a(8) =1052a(9) =999a(10) =1766a(11) =3749a(12) =2254a(13) =2253a(14) =1934a(15) =3391a(16) =4184a(17) =4463a(18) =3144a(19) =5451a(20) =9698a(21) =16279a(22) =6398a(23) =5123a(24) =2974a(25) =12863a(26) =19094a(27) =4299a(28) =16574a(29) =5749