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A193295 Number of prime divisors (with multiplicity) of n^2 - 1. 2
1, 3, 2, 4, 2, 5, 3, 5, 3, 5, 2, 5, 3, 6, 3, 7, 2, 6, 3, 5, 3, 6, 3, 6, 5, 5, 4, 6, 2, 8, 3, 7, 4, 6, 3, 6, 3, 6, 3, 7, 2, 6, 4, 5, 4, 7, 3, 8, 4, 6, 3, 7, 3, 8, 4, 6, 3, 6, 2, 6, 4, 8, 5, 9, 3, 6, 3, 6, 3, 8, 2, 7, 4, 5, 5, 6, 3, 8, 5, 7, 5, 6, 3, 6, 4, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

T. D. Noe, Table of n, a(n) for n = 2..10000

MATHEMATICA

Table[PrimeOmega[n^2 - 1], {n, 100}] (* Vladimir Joseph Stephan Orlovsky, Jul 22 2011 *)

PROG

(PARI) a(n)=bigomega(n^2-1) \\ Charles R Greathouse IV, Jul 30 2011

CROSSREFS

Cf. A046051, A054992, A054990, A054991, A082863.

Sequence in context: A057038 A175798 A294111 * A256918 A099871 A157220

Adjacent sequences:  A193292 A193293 A193294 * A193296 A193297 A193298

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jul 22 2011

STATUS

approved

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Last modified February 21 00:34 EST 2020. Contains 332086 sequences. (Running on oeis4.)