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A115691 Powerful(1) numbers (A001694) whose digit reversal is a triangular number. 2


%S 1,100,1000,5400,10000,54000,100000,540000,1000000,1306449,1728243,

%T 5400000,10000000,50086125,54000000,100000000,130644900,172824300,

%U 540000000,1000000000,1044000721,1306449000,1728243000,5008612500

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

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

%e 5400=2^3*3^3*5^2 is powerful and 45=T(9).

%Y Cf. A001694, A115692.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, Jan 31 2006

%E a(14)-a(24) from _Donovan Johnson_, Oct 01 2009

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Last modified November 27 12:26 EST 2015. Contains 264547 sequences.