id:A075027 - OEIS Search Results

Search: id:A075027

Displaying 1-1 of 1 results found.

page 1

Define a number k to occupy a divisor pole if d(k-1) < d(k) > d(k+1) where d(k) is the number of divisors of k. Sequence gives numbers occupying a divisor pole.

+0
3

4, 6, 8, 10, 12, 16, 18, 20, 24, 28, 30, 32, 36, 40, 42, 48, 50, 52, 54, 56, 60, 64, 66, 68, 70, 72, 78, 80, 84, 88, 90, 92, 96, 100, 102, 108, 110, 112, 114, 120, 124, 126, 128, 130, 132, 138, 140, 144, 150, 152, 154, 156, 160, 162, 165, 168, 170, 174, 176, 180 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Obviously every term is composite. The average of a twin prime pair is a member.`
	EXAMPLE	`10 is here since d(9) = 3, d(10) = 4, d(11) = 2 and 3 < 4 > 2.`
	CROSSREFS	`Cf. A075025, A075026.` `Sequence in context: A053226 A074827 A068354 this_sequence A076298 A163248 A034288` `Adjacent sequences: A075024 A075025 A075026 this_sequence A075028 A075029 A075030`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 02 2002`
	EXTENSIONS	`More terms from Jason Earls (zevi_35711(AT)yahoo.com), Sep 04 2002`

page 1

Search completed in 0.002 seconds

Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research