The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A025294 Numbers that are the sum of 2 nonzero squares in 3 or more ways. 2
 325, 425, 650, 725, 845, 850, 925, 1025, 1105, 1250, 1300, 1325, 1445, 1450, 1525, 1625, 1690, 1700, 1825, 1850, 1885, 2050, 2125, 2210, 2225, 2405, 2425, 2465, 2525, 2600, 2650, 2665, 2725, 2825, 2873, 2890, 2900, 2925, 3050, 3125, 3145, 3250, 3380 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A025426(a(n)) > 2. - Reinhard Zumkeller, Feb 26 2015 LINKS Robert Israel and Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 (first 2508 terms from Robert Israel) MAPLE N:= 100000: # generate all entries <=N SSQ:= {}: SSQ2:= {}: SSQ3:= {}: for a from 1 to floor(sqrt(N)) do   for b from a to floor(sqrt(N-a^2)) do     n:= a^2 + b^2;     if member(n, SSQ2) then SSQ3:= SSQ3 union {n}     elif member(n, SSQ) then SSQ2:= SSQ2 union {n}     else SSQ:= SSQ union {n}     end if end do end do: SSQ3;  # Robert Israel, Jan 20 2013 MATHEMATICA okQ[n_] := Length[Select[PowersRepresentations[n, 2, 2][[All, 1]], Positive] ] > 2; Select[Range[5000], okQ] (* Jean-François Alcover, Mar 04 2019 *) PROG (Haskell) a025294 n = a025294_list !! (n-1) a025294_list = filter ((> 2) . a025426) [1..] -- Reinhard Zumkeller, Feb 26 2015 CROSSREFS Complement of A025285 relative to A007692. - Washington Bomfim, Oct 24 2010 Cf. A025426. Sequence in context: A159844 A000443 A097101 * A025313 A025286 A025304 Adjacent sequences:  A025291 A025292 A025293 * A025295 A025296 A025297 KEYWORD nonn AUTHOR STATUS approved

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

Last modified February 26 10:42 EST 2020. Contains 332279 sequences. (Running on oeis4.)