

A139072


Smallest parameter k such that (n+k!)/n is prime.


6



1, 2, 3, 4, 7, 3, 11, 7, 8, 5, 13, 4, 28, 10, 7, 8, 43, 6, 21, 5, 7, 16, 48, 4, 14, 17, 9, 7, 241, 5, 61, 11, 17, 17, 8, 10, 44, 38, 16, 6, 131, 9, 63, 12, 6, 43, 73, 9, 15, 10, 19, 14, 64, 11, 12, 9, 24, 32, 641, 5, 89, 31, 8, 8, 14, 11, 71, 19, 25, 7, 151, 6, 78, 62, 15, 35, 15, 22, 87
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

a(n) >= A002034(n). [Charles R Greathouse IV, Jul 15 2011]


LINKS

Table of n, a(n) for n=1..79.


MATHEMATICA

a = {}; Do[k = 1; While[ ! PrimeQ[(k! + n)/n], k++ ]; AppendTo[a, k], {n, 1, 100}]; a (*Artur Jasinski*)


PROG

(PARI) pr(n)=denominator(n)==1 && ispseudoprime(n)
a(n)=my(k); until(pr(k++!/n+1), ); k \\ Charles R Greathouse IV, Jul 15 2011


CROSSREFS

Cf. A082672, A089085, A089130, A117141, A007749, A139056A139066, A020458, A139068, A137390, A139070A139075, A136019, A136020, A136026, A136027.
Sequence in context: A274767 A058315 A072717 * A021430 A297110 A267695
Adjacent sequences: A139069 A139070 A139071 * A139073 A139074 A139075


KEYWORD

nonn


AUTHOR

Artur Jasinski, Apr 07 2008


STATUS

approved



