A019273 - OEIS

A019273

First run of n consecutive integers with same number of divisors ends at a(n).

1, 3, 35, 245, 11609, 28379, 171899, 1043710445728, 2197379769828, 2642166652554084

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OFFSET

1,2

COMMENTS

The entry 40315 given in Guy and Wells is incorrect.

Terminating number in the sequence of consecutive integers with the same number of divisors in A006558. - Jud McCranie, Jan 14 2006

REFERENCES

R. K. Guy "Unsolved Problems in Number Theory", section B18.

David Wells "Dictionary of Curious and Interesting Numbers" #40311.

LINKS

EXAMPLE

phi(33)=phi(34)=phi(35), so a(3)=35

CROSSREFS

a(n)=A006558(n)+n-1.

KEYWORD

nonn,hard

AUTHOR

EXTENSIONS

More terms from Jud McCranie, Oct 04 2002

One more term from Jud McCranie, Jan 14 2006

a(10) by Jud McCranie, Nov 27 2018

STATUS

approved