Numbers of form 21k+1 or 21k+2 that use only digits 3 and 7.
337, 737, 7373, 73333, 73733, 333377, 333733, 737333, 737773, 777337, 777737
3 seqfan posts
Fri Dec 26 18:09:06 CET 2008 [seqfan] Re: A152824, A152852, A152853, Re: Re: Subset of A152824
Fri Dec 26 11:30:26 CET 2008 [seqfan] A152824, A152852, A152853, Re: Re: Subset of A152824
Sun Dec 14 12:17:55 CET 2008 [seqfan] Another Subset of A152824
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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