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Various Palindromic Number Records
Introduction

General formula for n-gonal is x/2[(n–2)x–(n–4)]

Feng Yuan January 6, 2008	TRIANGLE	3-gonal	base = 128184152897963669861552	24
	palindrome	8215588527084263951180440811593624807258855128		47
Feng Yuan January 31, 2008	SQUARE	4-gonal	base = 1373512530649258635292477609	28
	palindrome	1886536671850530641991373196913731991460350581766356881		55
Feng Yuan January 6, 2008	PENTA	5-gonal	base = 128481111918761748263908	24
	palindrome	24761094179822073249932323994237022897149016742		47
Feng Yuan January 5, 2008	HEXA	6-gonal	base = 13269591374387166732749	23
	palindrome	352164110486420593101030101395024684011461253		45
Feng Yuan January 6, 2008	HEPTA	7-gonal	base = 115095375604446234345993	24
	palindrome	33117363713821393460337673306439312831736371133		47
Feng Yuan January 3, 2008	OCTA	8-gonal	base = 790350914396051463771	21
	palindrome	1873963703660024006763676004200663073693781		43
Feng Yuan January 6, 2008	NONA	9-gonal	base = 115254230534871709541072	24
	palindrome	46492381796648740224886168842204784669718329464		47

W. Roonguthai August 31, 1997	PRONIC	n(n+1)	base = 255455445544554455445544554552	30
	palindrome	65257484658366826781688069846664896088618762866385648475256		59
P. De Geest May 6, 2000	Q-PRONIC	n(n+2)	base = 6035200088907	13
	palindrome	36423640113155131104632463		26
P. De Geest -- -- --	TETRA	(n)(n+1)(n+2)/6	base = 336	3
	palindrome	6378736		7
--- -- -- --	CUBE	n^3	base = 2201	4
	palindrome	10662526601		11
P. De Geest April 3, 2005	QU-SQR	n+(n+1)^2	base = 39213318281545047	17
	palindrome	1537684330649755115579460334867351		34
P. De Geest October 25, 1997	QO-SQR	n^2+(n+1)	base = 265455445544554455445437	24
	palindrome	70466593569257915890542124509851975296539566407		47
Feng Yuan April 4, 2002	SQUADD1	n^2+1	base = 23702356087344642	17
	palindrome	561801684091283606382190486108165		33