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A102750 Numbers n such that square of largest prime dividing n does not divide n. 18
2, 3, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 76, 77, 78, 79, 80, 82, 83, 84, 85 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that the exponent of the largest prime dividing n is one. - Harvey P. Dale, May 02 2019

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..25000

EXAMPLE

63 is included because 63 = 3^2 *7 and 7 (the largest prime dividing 63) only divides 63 once.

MATHEMATICA

Select[Range[2, 100], FactorInteger[#][[-1, 2]]==1&] (* Harvey P. Dale, May 02 2019 *)

PROG

(PARI) isok(n) = my(f = factor(n)); n % f[#f~, 1]^2; \\ Michel Marcus, May 20 2014

CROSSREFS

Cf. A070003 (complement, apart from the term 1 that is in neither sequence).

Sequence in context: A065872 A028741 A119316 * A317092 A225354 A166111

Adjacent sequences:  A102747 A102748 A102749 * A102751 A102752 A102753

KEYWORD

nonn

AUTHOR

Leroy Quet, Feb 09 2005

EXTENSIONS

More terms from Erich Friedman, Aug 08 2005

STATUS

approved

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Last modified October 16 15:51 EDT 2019. Contains 328101 sequences. (Running on oeis4.)