A097619 Numbers having more prime factors than each of their neighbors.

4, 6, 8, 12, 16, 18, 20, 24, 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, 104, 108, 110, 112, 114, 120, 126, 128, 130, 132, 138, 140, 144, 150, 152, 156, 160, 162, 168, 176, 180, 182, 184, 186, 189, 192, 196

Offset

1,1

Comments

Even terms are much more frequent. Among first 10000 terms exactly 612 are odd. First odd terms are 189, 243, 315, 405, 525, 567, 675; corresponding indices are 58, 77, 102, 130, 169, 182, 216. - Zak Seidov, Mar 06 2015

Links

Zak Seidov, Table of n, a(n) for n = 1..10000

Example

A001222(50)=A001222(2*5*5)=3 > A001222(50-1)=A001222(7*7)=2 and A001222(50) > A001222(50+1)=A001222(3*17)=2, therefore 50 is a term.

Crossrefs

Cf. A097620, A076082, A001222.

Sequence in context: A100390 A199768 A157932 * A113709 A076082 A162648

Adjacent sequences: A097616 A097617 A097618 * A097620 A097621 A097622

Keyword

nonn

Author

Reinhard Zumkeller, Aug 17 2004

Status

approved