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A242756
Semiprimes having only the curved digits.
1
6, 9, 22, 25, 26, 33, 35, 38, 39, 55, 58, 62, 65, 69, 82, 85, 86, 93, 95, 202, 203, 205, 206, 209, 226, 235, 253, 259, 262, 265, 289, 295, 298, 299, 302, 303, 305, 309, 323, 326, 329, 335, 339, 355, 358, 362, 365, 382, 386, 393, 395, 398, 502, 505, 526, 529, 533
OFFSET
1,1
COMMENTS
A curved-digit semiprime has only the curved digits, i.e., 0, 2, 3, 5, 6, 8 or 9.
LINKS
EXAMPLE
358 = 2 * 179 is semiprime having only the curved digits 3, 5 and 8. Hence appears in the sequence.
689 = 13 * 53 is semiprime having only the curved digits 6, 8 and 9. Hence appears in the sequence.
MATHEMATICA
A242756 = {}; Do[a = PrimeOmega[n]; If[a == 2 && Intersection[IntegerDigits[n], {1, 4, 7}] == {}, AppendTo[A242756, n]], {n, 1000}]; A242756
PROG
(PARI) s=[]; for(n=1, 600, if(bigomega(n)==2 && setintersect(vecsort(digits(n), , 8), [1, 4, 7])==[], s=concat(s, n))); s \\ Colin Barker, Jun 03 2014
CROSSREFS
KEYWORD
nonn,base
AUTHOR
K. D. Bajpai, May 22 2014
STATUS
approved