Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #7 Apr 29 2015 16:05:48
%S 2,4,61,2521,19958401,3113510401,177843714048001,60822550204416001,
%T 12926008369442488320001,4420880996869850977271808000001,
%U 4111419327088961408862781440000001
%N a(n)=(prime(n)!+2)/2.
%C For numbers of the form (p(n)!+1)/1 see A139159
%C For numbers of the form (p(n)!+2)/2 see A139160
%C For numbers of the form (p(n)!+3)/3 see A139161
%C For numbers of the form (p(n)!+4)/4 see A139162
%C For numbers of the form (p(n)!+5)/5 see A139163
%C For numbers of the form (p(n)!+6)/6 see A139164
%C For numbers of the form (p(n)!+7)/7 see A139165
%C For numbers of the form (p(n)!+8)/8 see A139166
%C For numbers of the form (p(n)!+9)/9 see A139089
%C For numbers of the form (p(n)!+10)/10 see A139168
%C For offsets for above sequences see A139169
%C For smallest integers of the form (p(m)!+n)/n see A139170
%t Table[(Prime[n]! + 2)/2, {n, 1, 30}]
%o (PARI) a(n)=prime(n)!/2 + 1 \\ _Charles R Greathouse IV_, Apr 29 2015
%Y Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A139148-A139157, A139159, A139160-A139166, A139089, A139168-A139170.
%K nonn
%O 1,1
%A _Artur Jasinski_, Apr 11 2008