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A179506 Semiprimes in carryless digital root arithmetic in base 10. 0
9, 30, 33, 36, 39, 60, 63, 66, 69, 93, 96, 100, 110, 113, 116, 117, 119, 120, 121, 123, 126, 129, 130, 132, 135, 138, 139, 140, 143, 144, 146, 149, 150, 153, 154, 156, 159, 160, 162, 165, 168, 169, 170, 171, 173, 176, 179, 180, 183, 186, 187, 189, 190, 192, 195, 198, 199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Products of pairs of elements of A169911 in carryless digital root arithmetic in base 10.

LINKS

Table of n, a(n) for n=1..57.

Index entries for sequences related to carryless arithmetic

EXAMPLE

a(1) = 9 because the smallest prime in carryless digital root arithmetic in base 10 is 3, and 3*3 = 9.

CROSSREFS

Cf. A169911.

Sequence in context: A104516 A279618 A158503 * A185653 A326150 A167154

Adjacent sequences:  A179503 A179504 A179505 * A179507 A179508 A179509

KEYWORD

base,nonn

AUTHOR

Jonathan Vos Post, Jul 17 2010

EXTENSIONS

Edited and corrected by N. J. A. Sloane, Jul 17 2010

STATUS

approved

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Last modified August 8 08:27 EDT 2020. Contains 336293 sequences. (Running on oeis4.)