cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A320322 Number of integer partitions of n whose product is a perfect power.

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%I A320322 #5 Oct 11 2018 10:09:55
%S A320322 1,0,0,0,2,2,5,5,9,11,18,19,28,30,42,50,68,76,102,113,146,170,212,241,
%T A320322 312,356,441,514,628,720,887,1008,1215,1403,1660,1903,2291,2609,3107,
%U A320322 3594,4254,4864,5739,6546,7672,8811,10237,11651,13583,15420,17867,20382
%N A320322 Number of integer partitions of n whose product is a perfect power.
%e A320322 The a(4) = 2 through a(11) = 19 integer partitions:
%e A320322   4   41   33    331    8       9        55        551
%e A320322   22  221  42    421    44      81       82        632
%e A320322            222   2221   422     333      91        821
%e A320322            411   4111   2222    441      433       911
%e A320322            2211  22111  3311    4221     442       4331
%e A320322                         4211    22221    811       4421
%e A320322                         22211   33111    3322      8111
%e A320322                         41111   42111    3331      33221
%e A320322                         221111  222111   4222      33311
%e A320322                                 411111   4411      42221
%e A320322                                 2211111  22222     44111
%e A320322                                          42211     222221
%e A320322                                          222211    422111
%e A320322                                          331111    2222111
%e A320322                                          421111    3311111
%e A320322                                          2221111   4211111
%e A320322                                          4111111   22211111
%e A320322                                          22111111  41111111
%e A320322                                                    221111111
%t A320322 Table[Length[Select[IntegerPartitions[n],GCD@@FactorInteger[Times@@#][[All,2]]>1&]],{n,30}]
%Y A320322 Cf. A003963, A064573, A305551, A319056, A319066, A319071, A319169, A320325.
%K A320322 nonn
%O A320322 0,5
%A A320322 _Gus Wiseman_, Oct 10 2018