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Powerful(1) numbers (A001694) whose digit reversal is a pentagonal number (A000326).
2

%I #5 Mar 30 2012 17:40:35

%S 1,100,500,529,1000,1089,2116,5000,6241,10000,50000,52900,100000,

%T 103041,108900,151875,211600,500000,529000,549152,624100,1000000,

%U 1089000,2116000,5000000,5290000,6241000,10000000

%N Powerful(1) numbers (A001694) whose digit reversal is a pentagonal number (A000326).

%H <a href="/index/Pow#powerful">Index entries for sequences related to powerful numbers</a>

%e 529=23^2 is powerful and 925 is the 25th pentagonal number.

%Y Cf. A000326, A001694, A115696.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, Jan 31 2006