The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A275450 Numbers n such that primorial(n) contains n as a string of digits. 2
 3, 9, 21, 27, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 50, 51, 52, 53, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 73, 74, 75, 76, 77, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 103, 107 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 FORMULA A275451(a(n)) > 0. EXAMPLE Primorial(3) equals 30, which contains 3, therefore 3 is in the sequence. MAPLE count:= 0: P:= 2; p:= 2; for n from 2 while count < 1000 do   p:= nextprime(p);   P:= P*p;   if StringTools:-Search(sprintf("%d", n), sprintf("%d", P))<>0 then      count:= count+1;      A[count]:= n;   fi od: seq(A[i], i=1..count); # Robert Israel, Jul 29 2016 MATHEMATICA primorial[n_]:=Product[Prime[i], {i, 1, n}]; Select[Range@500, StringContainsQ[ToString[primorial[#]], ToString[#]]&] PROG (Perl) use ntheory ":all"; my @a275450 = grep { index(pn_primorial(\$_), \$_) >= 0 } 1 .. 1000; say "@a275450"; # Dana Jacobsen, Aug 09 2016 CROSSREFS Cf. A002110 (primorial numbers), A275451. Sequence in context: A127174 A251535 A191177 * A244972 A044055 A029542 Adjacent sequences:  A275447 A275448 A275449 * A275451 A275452 A275453 KEYWORD base,easy,nonn AUTHOR Ivan N. Ianakiev, Jul 28 2016 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 5 15:08 EDT 2020. Contains 334848 sequences. (Running on oeis4.)