%I A117993
%S A117993 1,7,55,1177,3553,9517,11799,13579,17935,31753,71995,93799,117397,
%T A117993 121771,135373,371911,599515,777573,1331155,1371591,1555119,3391315,
%U A117993 3731377,3979717,5131573,7137715,7333353,9193933,13979515,15199191
%N A117993 Heptagonal numbers with only odd digits.
%Y A117993 Cf. A000566.
%Y A117993 Sequence in context: A054910 A028562 A094656 this_sequence A055056 A009521 
               A116120
%Y A117993 Adjacent sequences: A117990 A117991 A117992 this_sequence A117994 A117995 
               A117996
%K A117993 base,nonn
%O A117993 1,2
%A A117993 Luc Stevens (lms022(AT)yahoo.com), May 03 2006