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See A184986 to learn why 3331 is important.
Artur Jasinski, Table of n, a(n) for n = 1..2664 (full sequence)
Cf. A184979, A184986.
Sequence in context: A136492 A062506 A213199 * A242437 A188916 A080943
Adjacent sequences: A184984 A184985 A184986 * A184988 A184989 A184990
Artur Jasinski, Mar 27 2011