id:A075875 - OEIS Search Results

Search: id:A075875

Displaying 1-1 of 1 results found.

page 1

Triangular numbers which are 3-almost primes.

+0
3

28, 45, 66, 78, 105, 153, 171, 190, 231, 325, 406, 435, 465, 561, 595, 741, 861, 903, 946, 1378, 1653, 2211, 2278, 2485, 3081, 3655, 3741, 4371, 4465, 4753, 5151, 5253, 5995, 6441, 7021, 7381, 7503, 8515, 8911, 9453, 9591, 10011, 10153, 10585, 11026 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1)=28, 28 is a triangular number and 28=227 i.e. is a product of 3 prime factors so is 3-almost prime.`
	CROSSREFS	`Sequence in context: A056031 A061826 A144581 this_sequence A116541 A116565 A156719` `Adjacent sequences: A075872 A075873 A075874 this_sequence A075876 A075877 A075878`
	KEYWORD	`base,easy,nice,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Oct 19 2002`

page 1

Search completed in 0.002 seconds

Last modified November 25 13:42 EST 2009. Contains 167481 sequences.

AT&T Labs Research