login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A239674 Where records occur in A239656 (the first differences of sphenic numbers). 4
1, 2, 19, 498, 2114, 8351, 8381, 59704, 233890, 291963, 1119181, 1507131, 1839746, 9768399 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
A239673(n) = A239656(a(n)).
PROG
(Haskell)
a239674 n = a239674_list !! (n-1)
-- See A239673 for definition of A239674_list.
(PARI) list(lim)=my(v=List(), t); forprime(p=2, (lim)^(1/3), forprime(q=p+1, sqrt(lim\p), t=p*q; forprime(r=q+1, lim\t, listput(v, t*r)))); vecsort(Vec(v)) ; \\ A007304
chk(lim) = my(v=list(lim), dv = vector(#v-1, k, v[k+1] - v[k]), r=0); for (i=1, #dv, if (dv[i] > r, r=dv[i]; print1(i, ", ")); ); \\ Michel Marcus, Sep 20 2023
CROSSREFS
Sequence in context: A332967 A120420 A350939 * A306457 A158099 A015204
KEYWORD
nonn,more
AUTHOR
Reinhard Zumkeller, Mar 23 2014
EXTENSIONS
a(12)-a(14) from Michel Marcus, Sep 20 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)