The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A155566 Intersection of A001481 and A002481: N = a^2 + b^2 = c^2 + 6d^2 for some integers a,b,c,d. 1
 0, 1, 4, 9, 10, 16, 25, 36, 40, 49, 58, 64, 73, 81, 90, 97, 100, 106, 121, 144, 145, 160, 169, 193, 196, 202, 225, 232, 241, 250, 256, 265, 289, 292, 298, 313, 324, 337, 346, 360, 361, 388, 394, 400, 409, 424, 433, 441, 457, 484, 490, 505, 522, 529, 538, 576 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Contains A155576 as a subsequence (obtained by restricting a,b,c,d to be nonzero). Also contains A000290 (squares) as subsequence. LINKS Table of n, a(n) for n=1..56. PROG (PARI) isA155566(n, /* use optional 2nd arg to get other analogous sequences */c=[6, 1]) = { for(i=1, #c, for(b=0, sqrtint(n\c[i]), issquare(n-c[i]*b^2) & next(2)); return); 1} for( n=1, 600, isA155566(n) & print1(n", ")) CROSSREFS Cf. A001481, A002479, A003136, A002481, A020668 ff. Sequence in context: A117570 A337816 A272266 * A305231 A312832 A236652 Adjacent sequences: A155563 A155564 A155565 * A155567 A155568 A155569 KEYWORD easy,nonn AUTHOR M. F. Hasler, Jan 25 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 28 21:52 EDT 2023. Contains 363028 sequences. (Running on oeis4.)