A053180 Numbers ending in 7 which are not prime.

27, 57, 77, 87, 117, 147, 177, 187, 207, 217, 237, 247, 267, 287, 297, 327, 357, 377, 387, 407, 417, 427, 437, 447, 477, 497, 507, 517, 527, 537, 567, 597, 627, 637, 657, 667, 687, 697, 707, 717, 737, 747, 767, 777, 807, 817, 837, 847, 867, 897, 917, 927

Offset: 1

Author

Enoch Haga, Feb 29 2000

Keywords

• easy
• nonn
• base

Links

• G. C. Greubel, Table of n, a(n) for n = 1..10000

Crossrefs

Intersection of A002808 (composites) and A017353 (ending with 7). - Michel Marcus, Sep 04 2018

Programs

Mathematica

Select[Range[7,1000,10],!PrimeQ[#]&] (* Harvey P. Dale, Nov 03 2013 *)