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 A284662 #10 Apr 21 2017 20:38:09 %S A284662 1,1,3,0,5,2,19,0,0,37,10,19,21,0,0,0,89,143,84,97,26,0,127,283 %N A284662 Number of harmonic seed numbers (A035527) whose largest prime factor is the n-th odd prime (A065091). %H A284662 Yusuke Chishiki, Takeshi Goto, and Yasuo Ohno, <a href="https://doi.org/10.1090/S0025-5718-07-01933-3">On the largest prime divisor of an odd harmonic number</a>, Mathematics of Computation, Vol. 76, No. 259 (2007), pp. 1577-1587. %e A284662 There are 3 harmonic seed numbers whose largest prime factor is A065091(3) = 7 (28, 672 and 30240), thus a(3) = 3. %Y A284662 Cf. A035527. %K A284662 nonn,more %O A284662 1,3 %A A284662 _Amiram Eldar_, Mar 31 2017