OFFSET
1,1
COMMENTS
Subsidiary sequence: (1) Start of the first run of a string of n successive integers in this sequence. Conjecture: For every k there is a string of k successive integers.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A063464(n) + 1.
EXAMPLE
11 is a member as 10 and 12 both have two prime divisors.
26 is a member as 25 and 27 both have one each prime divisor.
PROG
(PARI) isok(n) = omega(n-1) == omega(n+1); \\ Michel Marcus, Oct 18 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 22 2003
EXTENSIONS
More terms from Ray Chandler, Sep 27 2003
Offset corrected and formula adapted by Michel Marcus, Oct 18 2016
STATUS
approved