A328226 - OEIS

A328226

Primitive elements of A278638.

6, 15, 20, 21, 28, 33, 35, 44, 52, 55, 65, 68, 76, 77, 85, 91, 95, 115, 117, 119, 133, 143, 145, 153, 155, 161, 171, 184, 185, 187, 203, 205, 207, 209, 215, 217, 221, 232, 235, 247, 248, 253, 259, 261, 265, 279, 287, 296, 299, 301, 305, 319, 323, 328, 329, 333, 335, 341

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OFFSET

1,1

COMMENTS

A number k belongs to this sequence if k is a term of A278638, while its proper divisors are not. It follows that A278638 is formed by the multiples of the terms of this sequence.

LINKS

Table of n, a(n) for n=1..58.

CROSSREFS

Cf. A000961, A001284, A072207, A278638.

Sequence in context: A291381 A280719 A282173 * A045848 A335268 A294651

Adjacent sequences: A328223 A328224 A328225 * A328227 A328228 A328229

KEYWORD

nonn

AUTHOR

Max Alekseyev, Oct 08 2019

STATUS

approved