id:A057602 - OEIS Search Results

Search: id:A057602

Displaying 1-1 of 1 results found.

page 1

a(1)=2, a(n+1) is the smallest integer > a(n) such that the smallest prime factor of a(n+1) is the largest prime factor of a(n).

+0
2

2, 4, 6, 9, 15, 25, 35, 49, 77, 121, 143, 169, 221, 289, 323, 361, 437, 529, 667, 841, 899, 961, 1147, 1369, 1517, 1681, 1763, 1849, 2021, 2209, 2491, 2809, 3127, 3481, 3599, 3721, 4087, 4489, 4757, 5041, 5183, 5329, 5767, 6241, 6557, 6889, 7387, 7921 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`Even numbered terms are squares of successive primes. Odd numbered terms are the product of two successive primes and are the square root of the product of the previous term and the next term - Jud McCranie (j.mccranie(AT)comcast.net), Oct 07 2000`
	CROSSREFS	`Cf. A000040.` `A033476.` `Sequence in context: A024787 A076922 A157679 this_sequence A006498 A074677 A101756` `Adjacent sequences: A057599 A057600 A057601 this_sequence A057603 A057604 A057605`
	KEYWORD	`nonn`
	AUTHOR	`G. L. Honaker, Jr. (honak3r(AT)gmail.com), Oct 07 2000`
	EXTENSIONS	`Additional terms from Jud McCranie (j.mccranie(AT)comcast.net), Oct 07 2000`

page 1

Search completed in 0.002 seconds

Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

AT&T Labs Research