A179506 Semiprimes in carryless digital root arithmetic in base 10.

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

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