id:A049121 - OEIS Search Results

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If a(n) is prime, a(n+1) = a(n) followed by a 1; if a(n) is composite, a(n+1) = concatenation of prime factors of a(n) (with multiplicity).

+0
3

0, 1, 11, 111, 337, 3371, 33711, 317661, 3195573, 33134361, 313849599, 3714945219, 33412771691, 1341179350213, 7181173232711, 28979247806109, 3318731171903071, 191053757165759337, 3505114323880284323 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`a(3)=111=3*37, so a(4)=3_37=337. 337 is prime, so a(5)=337_1=3371.`
	CROSSREFS	`Cf. A049201, A037274, A055657.` `Sequence in context: A092819 A062095 A055657 this_sequence A143573 A058947 A101680` `Adjacent sequences: A049118 A049119 A049120 this_sequence A049122 A049123 A049124`
	KEYWORD	`nonn,easy,base,nice`
	AUTHOR	`Mark Alexiuk (alexiuk(AT)ee.umanitoba.ca)`
	EXTENSIONS	`More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Corrected by Harvey P. Dale (hpd1(AT)is2.nyu.edu), Jun 06 2000.`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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