The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A350405 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A350405

a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly n ways, or 0 if no such number exists.
(history; published version)

#20 by OEIS Server at Thu Dec 30 20:06:04 EST 2021

LINKS

David A. Corneth, <a href="/A350405/b350405_1.txt">Table of n, a(n) for n = 3..102</a>

#19 by Alois P. Heinz at Thu Dec 30 20:06:04 EST 2021

STATUS

proposed

approved

Discussion

Thu Dec 30

20:06

OEIS Server: Installed new b-file as b350405.txt.  Old b-file is now b350405_1.txt.

#18 by Giorgos Kalogeropoulos at Thu Dec 30 19:52:43 EST 2021

STATUS

editing

proposed

#17 by Giorgos Kalogeropoulos at Thu Dec 30 19:52:30 EST 2021

MATHEMATICA

Do[i=1; While[b=PolygonalNumber[n, Range@i++]; !IntegerQ[t=Min[First/@Select[Tally[Select[Total/@Subsets[b, {n}], #<=Max@b&]], Last@#==n&]]]]; Print@t, {n, 3, 10}] (* Giorgos Kalogeropoulos, Dec 30 2021 *)

STATUS

proposed

editing

#16 by David A. Corneth at Thu Dec 30 15:26:20 EST 2021

STATUS

editing

proposed

Discussion

Thu Dec 30

15:46

David A. Corneth: so terms grow rather quickly

#15 by David A. Corneth at Thu Dec 30 15:25:56 EST 2021

FORMULA

a(n) >= A006484(n). - David A. Corneth, Dec 30 2021

CROSSREFS

Cf. A006484, A025443, A057145, A307598, A350207, A350241, A350288.

KEYWORD

nonn,more,new

#14 by David A. Corneth at Thu Dec 30 15:24:11 EST 2021

LINKS

David A. Corneth, <a href="/A350405/b350405_1.txt">Table of n, a(n) for n = 3..102</a>

#13 by David A. Corneth at Thu Dec 30 15:23:53 EST 2021

LINKS

David A. Corneth, <a href="/A350405/b350405.txt">TITLE FOR LINK</a>

#12 by David A. Corneth at Thu Dec 30 15:23:37 EST 2021

LINKS

David A. Corneth, <a href="/A350405/b350405.txt">TITLE FOR LINK</a>

#11 by David A. Corneth at Thu Dec 30 15:23:02 EST 2021

DATA

37, 142, 285, 536, 911, 1268, 1909, 2713, 3876, 5179, 6891, 8901, 11190, 14384, 18087, 21697, 27055, 32166, 39111, 46560, 53892, 64412, 73949, 86778, 98202, 113635, 130088, 148051, 167505, 190968, 214955, 240143, 269775, 297615, 331201, 367429, 409179, 451340, 497830

EXTENSIONS

More terms from David A. Corneth, Dec 30 2021

STATUS

approved

editing