|
| |
|
|
A139092
|
|
a(n) = number of (distinct) prime divisors of (9+prime(n)!)/9.
|
|
4
| |
|
|
3, 3, 2, 2, 2, 3, 2, 3, 4, 4, 5, 3, 3, 6, 5, 2, 3, 4, 3
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 4,1
|
|
|
COMMENTS
| Conjecture: all prime divisors in A139089 are distinct
|
|
|
MATHEMATICA
| a = {}; Do[w = (Prime[n]! + 9)/9; AppendTo[a, w], {n, 4, 16}]; a (*Artur Jasinski*)
|
|
|
CROSSREFS
| Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458, A139068, A137390, A139070, A139071, A139072, A139073, A139074, A139074, A139075, A136019, A136020, A136026, A136027, A139089, A139090, A139091, A139092.
Sequence in context: A133884 A065775 A096837 * A021305 A075788 A162235
Adjacent sequences: A139089 A139090 A139091 * A139093 A139094 A139095
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 08 2008
|
|
|
EXTENSIONS
| More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jul 16 2010
|
| |
|
|
