A139068
Primes of the form k!/9 + 1.
Original entry on oeis.org
4481, 611402462201343216650033936533361654773516861440000000001, 234195255375503079690400057633265510581087082006817356924774723468294901747510352675631491470712754833859385753600000000000000000001
Offset: 1
Cf.
A020458,
A007749,
A082672,
A089085,
A089130,
A117141,
A137390,
A139056,
A139057,
A139058,
A139059,
A139060,
A139061,
A139062,
A139063,
A139064,
A139065,
A139066,
A137390,
A139070,
A139071,
A139072,
A139156.
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a = {}; Do[If[PrimeQ[(n! + 9)/9], AppendTo[a, (n! + 9)/9]], {n, 1, 150}]; a
Select[Range[100]!/9+1,PrimeQ] (* Harvey P. Dale, Aug 17 2017 *)
-
for(n=6,1e4,if(ispseudoprime(t=n!/9+1),print1(t", "))) \\ Charles R Greathouse IV, Jul 15 2011
A139157
a(n) = (n!+10)/10.
Original entry on oeis.org
13, 73, 505, 4033, 36289, 362881, 3991681, 47900161, 622702081, 8717829121, 130767436801, 2092278988801, 35568742809601, 640237370572801, 12164510040883201, 243290200817664001, 5109094217170944001
Offset: 5
Cf.
A007749,
A020458,
A082672,
A089085,
A089130,
A117141,
A139056-
A139066,
A139068,
A137390,
A139070-
A139075,
A139148-
A139156,
A139159,
A139160,
A139161,
A139162.
-
Table[(n! + 10)/10, {n, 5, 30}]
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for(n=5, 20, a=(n!+10)/10; print1(a, ", ")) \\ Felix Fröhlich, Jul 07 2014
A139151
a(n) = (n!+4)/4.
Original entry on oeis.org
7, 31, 181, 1261, 10081, 90721, 907201, 9979201, 119750401, 1556755201, 21794572801, 326918592001, 5230697472001, 88921857024001, 1600593426432001, 30411275102208001, 608225502044160001, 12772735542927360001
Offset: 4
A139149
a(n) = (n!+2)/2.
Original entry on oeis.org
2, 4, 13, 61, 361, 2521, 20161, 181441, 1814401, 19958401, 239500801, 3113510401, 43589145601, 653837184001, 10461394944001, 177843714048001, 3201186852864001, 60822550204416001, 1216451004088320001, 25545471085854720001, 562000363888803840001
Offset: 2
(1!+2)/2 = 3/2 is not an integer.
a(2) = (2!+2)/2 = 2.
Offsets for above sequences are Kempner numbers
A002034.
For smallest number of the form (m!+n)/n see
A139148.
Cf.
A007749,
A020458,
A082672,
A089085,
A089130,
A117141,
A137390,
A139056-
A139066,
A139068,
A139070-
A139075,
A139157,
A139159-
A139162.
Showing 1-4 of 4 results.
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