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 A001987 M5235 N2278 #27 Nov 04 2023 13:44:03 %S A001987 1,1,1,1,1,1,1,1,1,1,1,33,79,79,107,107,311,487,487,665,665,857,2293, %T A001987 3523,3523,3523,13909,13909,13909,26713,29351,29351,59801,70877,70877, %U A001987 70877,70877,296475,296475,296475,296475,3201195 %N A001987 Class numbers associated with terms of A001986. %D A001987 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001987 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001987 Michael John Jacobson, Jr., <a href="http://hdl.handle.net/1993/18862">Computational Techniques in Quadratic Fields</a>, Master's thesis, University of Manitoba, Winnipeg, Manitoba, 1995. %H A001987 Michael John Jacobson Jr. and Hugh C. Williams, <a href="https://doi.org/10.1090/S0025-5718-02-01418-7">New quadratic polynomials with high densities of prime values</a>, Math. Comp. 72 (2003), 499-519. %H A001987 D. H. Lehmer, E. Lehmer and D. Shanks, <a href="https://doi.org/10.1090/S0025-5718-1970-0271006-X">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451. %H A001987 D. H. Lehmer, E. Lehmer and D. Shanks, <a href="/A002189/a002189.pdf">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451 [Annotated scanned copy] %Y A001987 Cf. A001986, A094846. See also A094842, A094851. %K A001987 nonn %O A001987 1,12 %A A001987 _N. J. A. Sloane_ %E A001987 Revised by _N. J. A. Sloane_, Jun 14 2004