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#20 by Joerg Arndt at Wed Sep 23 03:27:46 EDT 2020
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#19 by Michel Marcus at Tue Sep 22 16:03:31 EDT 2020
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#18 by M. F. Hasler at Tue Sep 22 15:53:09 EDT 2020
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#17 by M. F. Hasler at Tue Sep 22 15:52:36 EDT 2020
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(PARI) is(N)=isprime(N)&&!#setminus(Set ((digits(N)), [4, 9]) \\ M. F. Hasler, Sep 22 2020
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| CROSSREFS
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Cf. A036319. (composite numbers having all their prime factors in this sequence).
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#16 by M. F. Hasler at Tue Sep 22 15:46:37 EDT 2020
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(PARI) is(N)=isprime(N)&&!#setminus(Set (digits(N)), [4, 9]) \\ M. F. Hasler, Sep 22 2020
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| STATUS
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approved
editing
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#15 by N. J. A. Sloane at Mon Sep 21 16:27:05 EDT 2020
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#14 by N. J. A. Sloane at Mon Sep 21 16:26:52 EDT 2020
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| CROSSREFS
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Cf. A036319.
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| STATUS
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approved
editing
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#13 by OEIS Server at Wed Nov 20 21:45:41 EST 2019
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| LINKS
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Alois P. Heinz, <a href="/A020466/b020466_1.txt">Table of n, a(n) for n = 1..20000</a> (first 1000 terms from Vincenzo Librandi)
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#12 by Alois P. Heinz at Wed Nov 20 21:45:41 EST 2019
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Discussion
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| Wed Nov 20
| 21:45
| OEIS Server: Installed new b-file as b020466.txt. Old b-file is now b020466_1.txt.
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#11 by Alois P. Heinz at Wed Nov 20 21:45:37 EST 2019
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VincenzoAlois LibrandiP. Heinz, <a href="/A020466/b020466_1.txt">Table of n, a(n) for n = 1..100020000</a>> (first 1000 terms from Vincenzo Librandi)
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