A091782 - OEIS

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A091782

a(1) = 1, a(2) = 1, a(3) = a(1) + concatenation a(1), a(2). In general a(n) = a(1) + a(1)a(2)+ a(1)a(2)a(3) + ... + a(1)a(2)...a(n-1), where a(1)a(2)...a(r) is the concatenation of first r terms.

1, 1, 12, 1124, 11122248, 1112112422244496, 11121124111222482224224844488992, 1112112411122248111211242224449622242248222444964448449688977984 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	FORMULA	`a(n) = concat(a(1), ..., a(n-1)) + a(n-1). - Charles R Greathouse IV, Mar 30 2004`
	EXAMPLE	`a(3) = 1+11 = 12.`
	CROSSREFS	`Cf. A091781.` `Sequence in context: A004073 A109229 A112457 * A112580 A180586 A178529` `Adjacent sequences: A091779 A091780 A091781 * A091783 A091784 A091785`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 17 2004`
	EXTENSIONS	`More terms from Charles R Greathouse IV, Mar 30 2004`

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Last modified February 13 02:33 EST 2012. Contains 205435 sequences.