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A003598 Numbers of the form 5^i*11^j. 15
1, 5, 11, 25, 55, 121, 125, 275, 605, 625, 1331, 1375, 3025, 3125, 6655, 6875, 14641, 15125, 15625, 33275, 34375, 73205, 75625, 78125, 161051, 166375, 171875, 366025, 378125, 390625, 805255, 831875, 859375, 1771561, 1830125, 1890625 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..36.

FORMULA

An asymptotic formula for a(n) is roughly 1/sqrt(55)*exp(sqrt(2*ln(5)*ln(11)*n)) - Benoit Cloitre, Mar 08 2002

MATHEMATICA

Take[Union[(5^#[[1]] 11^#[[2]])&/@Tuples[Range[0, 20], {2}]], 50]  [From Harvey P. Dale, Dec 26 2010]

PROG

(PARI) list(lim)=my(v=List(), N); for(n=0, log(lim)\log(11), N=11^n; while(N<=lim, listput(v, N); N*=5)); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jun 28 2011

CROSSREFS

Sequence in context: A167238 A084640 A056739 * A014858 A018368 A050344

Adjacent sequences:  A003595 A003596 A003597 * A003599 A003600 A003601

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 22 23:43 EST 2014. Contains 249835 sequences.