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A075031 a(n) is the smallest number k such that the number of divisors of the n numbers from k through k+n-1 are nonincreasing. 5
1, 2, 20, 20, 714, 714, 25550, 90180, 142803, 809300, 27195648, 27195648, 6973441007, 37962822225, 37962822225, 114296059262, 265228019405583, 394047434860662, 2493689139940250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

tau(k) >= tau(k+1) >= ... >= tau(k+n-1).

Next term is > 2000000. - David Wasserman, May 06 2005

a(17) > 10^12. [Donovan Johnson, Oct 13 2009]

a(20) > 2.64x10^15. - Jud McCranie, Mar 27 2019

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

a(3)=a(4) = 20 as tau(20) > tau(21) = tau(22) > tau(23).

CROSSREFS

Cf. A075028, A075029, A075046.

Sequence in context: A221921 A012739 A261753 * A273466 A278938 A303157

Adjacent sequences:  A075028 A075029 A075030 * A075032 A075033 A075034

KEYWORD

nonn,more

AUTHOR

Amarnath Murthy, Sep 02 2002

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003

a(11)-a(16) from Donovan Johnson, Oct 13 2009

a(17)-a(19) from Jud McCranie, Mar 27 2019

STATUS

approved

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Last modified September 18 16:46 EDT 2021. Contains 347529 sequences. (Running on oeis4.)