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 A025699 #24 Jul 06 2025 13:09:27 %S A025699 1,2,4,6,9,12,16,20,25,30,36,42,49,56,64,72,81,90,100,111,122,134,146, %T A025699 159,172,186,200,215,230,246,262,279,296,314,332,351,371,391,412,433, %U A025699 455,477,500,523,547,571,596,621,647,673,700,727,755,784,813,843,873,904,935 %N A025699 Index of 3^n within sequence of numbers of form 3^i*8^j (A025615). %C A025699 Not same as A002620. %C A025699 The first 19 positive terms are the same, then a(20) = 111 while A002620(21) = 110. - _Bernard Schott_, Dec 31 2021 %C A025699 Positions of zeros in A025672. - _R. J. Mathar_, Jul 06 2025 %F A025699 A025615(a(n)) = 3^(n-1). - _Bernard Schott_, Dec 27 2021 %Y A025699 Cf. A002620, A003586, A025615, A025728 (similar for 8^n). %K A025699 nonn %O A025699 1,2 %A A025699 _David W. Wilson_