A274831 Strobogrammatic (A000787) composite numbers whose prime factors are strobogrammatic as well.

1111, 11088011, 16169191, 101808101, 616101919, 668808899, 686808989, 1016969101, 1106699011, 1199006611, 6068888909, 6699116699, 6699886699, 11990006611, 16168089191, 19190006161, 19198086161, 66110001199, 66880008899, 110668899011, 161600009191

Offset

1,1

Comments

The smallest term which is the product of 3 primes is 1111008888001111 = 11 * 101 * 1000008000001. The smallest term which is not a multiple of 11 or 101 is a(790) = 100111801888108111001 = 100111001 * 1000008000001.

Links

Giovanni Resta, Table of n, a(n) for n = 1..1000

Example

16169191 is a term because it is equal to 101 * 160091.

Crossrefs

Cf. A000787, A007597.

Sequence in context: A275944 A291945 A015292 * A154805 A203897 A236050

Adjacent sequences: A274828 A274829 A274830 * A274832 A274833 A274834

Keyword

nonn,base

Author

G. L. Honaker, Jr. and Giovanni Resta, Jul 08 2016

Status

approved