A373837 - OEIS

A373837

Numbers k such that bigomega(k) and A276085(k) are both multiples of 3, where bigomega (A001222) and A276085 are fully additive with a(p) = 1 and a(p) = p#/p respectively.

1, 8, 27, 30, 42, 64, 66, 78, 102, 114, 125, 138, 174, 175, 186, 216, 222, 240, 245, 246, 258, 275, 282, 318, 325, 336, 343, 354, 366, 385, 402, 425, 426, 438, 455, 474, 475, 498, 512, 528, 534, 539, 575, 582, 595, 605, 606, 618, 624, 637, 642, 654, 665, 678, 715, 725, 729, 762, 775, 786, 805, 810, 816, 822, 833

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OFFSET

1,2

COMMENTS

Because A145784 and A339746 are both multiplicative semigroups (as A001222 and A276085 are completely additive), this is also: if m and n are in the sequence then so is m*n.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..12000

PROG

(PARI) isA373837 = A373836;

CROSSREFS

Cf. A001222, A276085, A373836 (characteristic function).

Intersection of A145784 and A339746.

Sequence in context: A084698 A070497 A070496 * A304636 A115169 A070495

Adjacent sequences: A373834 A373835 A373836 * A373838 A373839 A373840

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 19 2024

STATUS

approved