The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A174069 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A174069

Numbers that can be written as a sum of at least 2 squares of consecutive positive integers.
(history; published version)

#32 by N. J. A. Sloane at Sat Jan 09 19:33:21 EST 2016

STATUS

editing

approved

#31 by N. J. A. Sloane at Sat Jan 09 19:33:06 EST 2016

CROSSREFS

See also A062681, A212016.

STATUS

proposed

editing

Discussion

Sat Jan 09

19:33

N. J. A. Sloane: added missing cross-references

#30 by Michel Marcus at Sun Dec 27 02:26:47 EST 2015

STATUS

editing

proposed

#29 by Michel Marcus at Sun Dec 27 02:26:41 EST 2015

PROG

(PARI) N=20; a=[]; for(i=2, N, for(k=1, i-1, if(N^2*2>t=sum(j=i-k, i, j^2), a=setunion(a, Set(t)), break))); a \\ - __M. F. Hasler_, Dec 22 2013

STATUS

proposed

editing

#28 by Altug Alkan at Thu Dec 24 16:53:48 EST 2015

STATUS

editing

proposed

#27 by Altug Alkan at Thu Dec 24 16:53:00 EST 2015

MATHEMATICA

max = 50^2; lst = {}; Do[z = n^2; Do[z += (n + x)^2; If[z > max, Break[]]; AppendTo[lst, z], {x, max/2}], {n, max/2}]; Union[lst] (* Orlowski *)

STATUS

proposed

editing

Discussion

Thu Dec 24

16:53

Altug Alkan: You are right Mr. Michael, I think it is author's last name, thanks, best regards.

#26 by Altug Alkan at Thu Dec 24 11:20:03 EST 2015

STATUS

editing

proposed

Discussion

Thu Dec 24

14:56

Michael De Vlieger: Is Mathematica "Orlowski" the same as Vladimir's last name? If so I don't think it needs attribution.

#25 by Altug Alkan at Thu Dec 24 11:19:25 EST 2015

COMMENTS

A subseqeuce subsequence of A212016. This sequence focuses on the squares of consecutive positive integers. - Altug Alkan, Dec 24 2015

STATUS

proposed

editing

#24 by Altug Alkan at Thu Dec 24 11:14:44 EST 2015

STATUS

editing

proposed

#23 by Altug Alkan at Thu Dec 24 11:13:37 EST 2015

COMMENTS

A subseqeuce of A212016. This sequence focuses on the squares of consecutive positive integers. A212016 lists sums of two or more consecutive all integer squares. - Altug Alkan, Dec 24 2015

Discussion

Thu Dec 24

11:14

Altug Alkan: I am not sure about sentence is ok. Please help about it, if it is necessary. Thanks. Best regards.