Number of permutations p of [n] such that i + p(i) is composite for all i.
A392408
Number of permutations p of [n] such that i + p(i) is composite for all i.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =9a(6) =32a(7) =189a(8) =1368a(9) =8210a(10) =44148a(11) =389912a(12) =3101440a(13) =35058904a(14) =443288708a(15) =5108994142a(16) =55028376940a(17) =780766798385
External references
- oeis: A392408