login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082121 Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 7. 1
7, 6, 11, 19, 37, 109, 515, 3301, 267271, 130914197, 209015618081, 887384060899271, 58605404461258015758293 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..12.

PROG

(PARI) p=7; print1(p, ", "); for(n=1, 50, v=divisors(p); r=sqrt(p); t=0; for(k=1, matsize(v)[2], if(v[k]>=r, t=k; break)); if(v[t]^2==p, u=t, u=t-1); if(v[t]-v[u]<2, u=u-1; t=t+1); print1(v[t]-v[u]", "); p=p*(v[t]-v[u]))

CROSSREFS

Cf. A082120, A003681 (starts with 2, 3), A082122.

Sequence in context: A021569 A085964 A281313 * A215338 A176414 A297153

Adjacent sequences:  A082118 A082119 A082120 * A082122 A082123 A082124

KEYWORD

nonn,hard

AUTHOR

Ralf Stephan, Apr 04 2003

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 16 21:47 EST 2018. Contains 317275 sequences. (Running on oeis4.)