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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A051038 11-smooth numbers: i.e. numbers whose prime divisors are all <= 11. 29
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 27, 28, 30, 32, 33, 35, 36, 40, 42, 44, 45, 48, 49, 50, 54, 55, 56, 60, 63, 64, 66, 70, 72, 75, 77, 80, 81, 84, 88, 90, 96, 98, 99, 100, 105, 108, 110, 112, 120, 121, 125, 126, 128, 132, 135, 140 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A155182 is a finite subsequence. [From Reinhard Zumkeller, Jan 21 2009]

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..5000 [From Reinhard Zumkeller, Jan 21 2009]

Eric Weisstein's World of Mathematics, Smooth Number.

MATHEMATICA

mx = 150; Sort@ Flatten@ Table[ 2^i*3^j*5^k*7^l*11^m, {i, 0, Log[2, mx]}, {j, 0, Log[3, mx/2^i]}, {k, 0, Log[5, mx/(2^i*3^j)]}, {l, 0, Log[7, mx/(2^i*3^j*5^k)]}, {m, 0, Log[11, mx/(2^i*3^j*5^k*7^l)]}] (* Robert G. Wilson v, Aug 17 2012 *)

aQ[n_]:=Max[First/@FactorInteger[n]]<=11; Select[Range[140], aQ[#]&] (* Jayanta Basu, Jun 05 2013 *)

PROG

(PARI) test(n)= {m=n; forprime(p=2, 11, while(m%p==0, m=m/p)); return(m==1)} for(n=1, 200, if(test(n), print1(n", ")))

(MAGMA) [n: n in [1..150] | PrimeDivisors(n) subset PrimesUpTo(11)]; // Bruno Berselli, Sep 24 2012

CROSSREFS

For p-smooth numbers with other values of p, see A003586, A051037, A002473, A080197, A080681, A080682, A080683.

Subsequence of A033620.

Sequence in context: A033620 A033637 A084347 * A140332 A155182 A096076

Adjacent sequences:  A051035 A051036 A051037 * A051039 A051040 A051041

KEYWORD

easy,nonn

AUTHOR

Eric W. Weisstein

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 December 9 14:38 EST 2016. Contains 278971 sequences.