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A079323 First number in a sequence of 4 consecutive economical numbers. 1
179210312, 10189653632, 11306629375, 12372501247, 12450928125, 16064890623, 100911346046, 102029981184, 103029727742, 103538511872, 103852693375, 105264783872, 107943730622, 112167589373, 114281242494, 115827546751 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..16.

J.-M. De Koninck and F. Luca, On strings of consecutive economical numbers of arbitrary length

Eric Weisstein's World of Mathematics, Economical Number

EXAMPLE

a(2) = 10189653632 because 10189653632 ( = 2^7 * 79606669), 10189653633 ( = 3^6 * 733 * 19069), 10189653634 ( = 2 * 227^2 * 98873), 10189653635 ( = 5 * 7^3 * 5941489) form a sequence of 4 consecutive economical numbers.

CROSSREFS

Cf. A047738.

Sequence in context: A206520 A127955 A047738 * A228760 A204529 A211239

Adjacent sequences:  A079320 A079321 A079322 * A079324 A079325 A079326

KEYWORD

hard,nonn,base

AUTHOR

Sudipta Das (juitech(AT)vsnl.net), Feb 12 2003

EXTENSIONS

a(7)-a(16) from Donovan Johnson, Apr 14 2010

STATUS

approved

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Last modified November 22 16:31 EST 2019. Contains 329396 sequences. (Running on oeis4.)