A069502 - OEIS

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A069502

a(1) = 1; a(n) = smallest multiple of a(n-1) which is a palindromic triangular number.

1, 3, 6, 66, 8778, 6172882716 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`a(7) must be larger than 5*10^41 - pdg.`
	LINKS	`P. De Geest, List of palindromic triangulars`
	CROSSREFS	`Cf. A069501.` `Sequence in context: A127637 A068665 A050722 * A205081 A182966 A023174` `Adjacent sequences: A069499 A069500 A069501 * A069503 A069504 A069505`
	KEYWORD	`nonn,base,hard`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002.`
	EXTENSIONS	`a(6) from Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 11 2003.`

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.