id:A074923 - OEIS Search Results

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Number of steps to reach the first integer starting with prime(n+1)/prime(n) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

+0
1

1, 6, 18, 5, 5, 7, 37, 132, 29, 63, 46, 11, 7, 212, 25, 38, 145, 136, 46, 118, 39, 37, 24, 15, 19, 85, 211, 179, 249, 266, 190, 87, 259, 216, 16, 70, 210, 56, 255, 94, 143, 244, 482, 558, 46, 327, 271, 93, 110, 8, 121, 29, 421, 329, 47, 40, 394, 376, 64, 249, 49, 390, 321 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(4)=5 since A000040(4+1)/A000040(4)=11/7 -> 22/7 -> 88/7 -> 1144/7 -> 187616/7 -> 718381664.`
	CROSSREFS	`Cf. A073524, A000040.` `Sequence in context: A024080 A099436 A077022 this_sequence A093061 A078741 A129870` `Adjacent sequences: A074920 A074921 A074922 this_sequence A074924 A074925 A074926`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 04 2002`
	EXTENSIONS	`Extended by Max Alekseyev (maxale(AT)gmail.com), Jul 28 2009`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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