This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A291354 #22 May 04 2025 06:34:50 %S A291354 1016949152542372881355932203389830508474576271186440677966, %T A291354 1186440677966101694915254237288135593220338983050847457627, %U A291354 1355932203389830508474576271186440677966101694915254237288 %N A291354 Numbers m with the property that shifting the rightmost digit of m to the left end multiplies the number by 6. %C A291354 For consistency with A146088 (similar for ratio k=2) and others, where an initial a(0) = 0 has been added, the same could be considered here. It would be compatible with the formula given for a(4k). - _M. F. Hasler_, May 03 2025 %H A291354 Seiichi Manyama, <a href="/A291354/b291354.txt">Table of n, a(n) for n = 1..68</a> %H A291354 Wikipedia, <a href="https://en.wikipedia.org/wiki/Parasitic_number">Parasitic number</a>. %F A291354 a(4*k - 3) = 6*(10^(58*k) - 1)/59. %F A291354 a(4*k - 2) = 7*(10^(58*k) - 1)/59. %F A291354 a(4*k - 1) = 8*(10^(58*k) - 1)/59. %F A291354 a(4*k) = 9*(10^(58*k) - 1)/59. %Y A291354 Cf. A146088 (k=2), A146561 (k=3), A146569 (k=4), A146754 (k=5), this sequence (k=6), A291215 (k=7), A291321 (k=8), A291353 (k=9). %Y A291354 All these are subsequences of A034089 (except for an initial 0 in some of them). %Y A291354 Cf. A092697, A097717. %K A291354 nonn,base,easy %O A291354 1,1 %A A291354 _Seiichi Manyama_, Aug 23 2017