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A324593 a(n) is the smallest number k such that n consecutive integers starting at k have the same number of odd divisors (A001227). 2
1, 1, 5, 10, 10, 515, 2314, 2314, 1536863, 4053992, 4053992, 18584686, 146237365, 163039279, 4775943486, 13147233734, 86153130379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..17.

Rémy Sigrist, C program for A324593

EXAMPLE

515 has 4 odd divisors {1, 5, 103, 515}, 516 has 4 odd divisors {1, 3, 43, 129}, 517 has 4 odd divisors {1, 11, 47, 517}, 518 has 4 odd divisors {1, 7, 37, 259}, 519 has 4 odd divisors {1, 3, 173, 519} and 520 has 4 odd divisors {1, 5, 13, 65}. These the first 6 consecutive numbers with the same number of odd divisors, so a(6) = 515.

PROG

(C) See Links section.

CROSSREFS

Cf. A001227, A006558, A045983, A045984, A323253, A324594.

Sequence in context: A256641 A032242 A208541 * A107975 A262665 A106792

Adjacent sequences:  A324590 A324591 A324592 * A324594 A324595 A324596

KEYWORD

nonn,more

AUTHOR

Ilya Gutkovskiy, Sep 03 2019

EXTENSIONS

a(11)-a(14) from Rémy Sigrist, Sep 04 2019

a(15)-a(17) from Giovanni Resta, Sep 04 2019

STATUS

approved

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Last modified February 24 13:05 EST 2020. Contains 332209 sequences. (Running on oeis4.)