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A274831 Strobogrammatic (A000787) composite numbers whose prime factors are strobogrammatic as well. 1
1111, 11088011, 16169191, 101808101, 616101919, 668808899, 686808989, 1016969101, 1106699011, 1199006611, 6068888909, 6699116699, 6699886699, 11990006611, 16168089191, 19190006161, 19198086161, 66110001199, 66880008899, 110668899011, 161600009191 (list; graph; refs; listen; history; text; internal format)
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: A225238 A275944 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

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Last modified February 19 10:40 EST 2018. Contains 299330 sequences. (Running on oeis4.)