login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108631 Semiprimes with nonprime digits (no digits 2,3,5,7 in semiprimes). 2
4, 6, 9, 10, 14, 46, 49, 69, 86, 91, 94, 106, 111, 118, 119, 141, 146, 161, 166, 169, 194, 411, 446, 466, 469, 481, 489, 611, 614, 649, 669, 681, 689, 694, 698, 699, 818, 841, 849, 866, 869, 886, 889, 898, 899, 901, 914, 949, 961, 989, 998 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of 108632 in the class of semiprimes.

LINKS

Table of n, a(n) for n=1..51.

MATHEMATICA

Select[Range[1000], PrimeOmega[#]==2&&ContainsOnly[IntegerDigits[#], {0, 1, 4, 6, 8, 9}]&] (* Harvey P. Dale, Aug 15 2017 *)

CROSSREFS

Cf. A108632.

Sequence in context: A142863 A318990 A132435 * A200677 A189553 A189482

Adjacent sequences:  A108628 A108629 A108630 * A108632 A108633 A108634

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Jun 13 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 15 20:06 EDT 2021. Contains 348034 sequences. (Running on oeis4.)