OEIS sequence identifier found for P(n)

diff --git a/helm/software/matita/contribs/character/classes/defs.ma b/helm/software/matita/contribs/character/classes/defs.ma
index e31c9a93c2bfe5a22abb26e09435d02dbde04707..d5986fe7779a5d20926408cdc9cbef0c7e57a1ee 100644 (file)
--- a/helm/software/matita/contribs/character/classes/defs.ma
+++ b/helm/software/matita/contribs/character/classes/defs.ma
@@ -14,6 +14,10 @@
 
 include "preamble.ma".
 
+(* NOTE: OEIS sequence identifiers 
+   P(n): A016777 "3n+1"
+*)         
+
 inductive P: nat \to Prop \def
    | p1: P 1
    | p2: \forall i,j. T i \to P j \to P (i + j)