

A101323


Numbers n such that 2^n*(n+1)!1 is prime.


1



1, 2, 3, 5, 6, 7, 10, 12, 101, 117, 227, 884, 1323, 2167, 3483, 6274, 7887
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OFFSET

1,2


COMMENTS

a(18) > 10^4. Robert Price, Mar 08 2015


LINKS

Table of n, a(n) for n=1..17.


MATHEMATICA

Select[Range[1000], PrimeQ[2^# (#+1)!1]&] (* Harvey P. Dale, Nov 23 2014 *)


PROG

(MAGMA) [n: n in [0..500]  IsPrime(2^n*Factorial(n+1)1)]; // Vincenzo Librandi, Mar 08 2015
(PARI) is(n)=ispseudoprime(2^n*(n+1)!1) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A093155.
Sequence in context: A090034 A037016 A239746 * A298705 A030051 A183071
Adjacent sequences: A101320 A101321 A101322 * A101324 A101325 A101326


KEYWORD

nonn


AUTHOR

Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Dec 24 2004


EXTENSIONS

a(12) from Harvey P. Dale, Nov 23 2014
a(13)a(17) from Robert Price, Mar 08 2015


STATUS

approved



