Smallest n-th order perfect digital invariant or PDI: smallest number > 1 equal to sum of n-th powers of its digits, or 0 if no such number.
2, 0, 153, 1634, 4150, 548834, 1741725, 24678050, 146511208, 4679307774
5 seqfan posts
Sun Jun 10 13:14:09 CEST 2012 [seqfan] Re: Prime signature of 1, and second signature
Sun Jun 10 06:21:15 CEST 2012 [seqfan] Re: Prime signature of 1, and second signature
Sun Jun 10 04:15:34 CEST 2012 [seqfan] Prime signature of 1, and second signature
Thu Jun 18 01:29:24 CEST 2009 [seqfan] Re: Sloane's Sequence A023052
Wed Jun 17 18:06:35 CEST 2009 [seqfan] Re: Sloane's Sequence A023052
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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