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URL: https://oeis.org/A107624

⇱ A107624 - OEIS

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A107624
Numbers n such that every digit of n and n-th prime contains a loop (only digits 0,4,6,8,9 in n and n-th prime).
3
80, 600, 669, 884, 4646, 4666, 4806, 4980, 6480, 6666, 6806, 6849, 8448, 8688, 9489, 9494, 40046, 40664, 40804, 49848, 64444, 64466, 68864, 68994, 69008, 69060, 69084, 69089, 69090, 69899, 440986, 440999, 444049, 444080, 464446, 464496, 464499, 466466, 466844
OFFSET
1,1
COMMENTS
Corresponding primes in A107625. Cf. A001744 Every digit contains a loop.
MATHEMATICA
Do[id=Union[IntegerDigits[Prime[n]], IntegerDigits[n]]; If[Count[id, 1]+Count[id, 2]+Count[id, 3]+Count[id, 5]+Count[id, 7]==0, Print[n]], {n, 10000}]
PROG
(PARI) is_a001744(n) = #setintersect(vecsort(digits(n), , 8), [1, 2, 3, 5, 7])==0
is(n) = is_a001744(n) && is_a001744(prime(n)) \\ Felix Fröhlich, Sep 09 2019
CROSSREFS
Sequence in context: A200432 A233351 A365887 * A388001 A389955 A068782
KEYWORD
nonn,base,dumb
AUTHOR
Zak Seidov, May 18 2005
EXTENSIONS
More terms from Felix Fröhlich, Sep 09 2019
STATUS
approved