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Search: id:A069556
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| A069556 |
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Primes in which the k-th digit (counting from the right) is either a nonzero multiple of k or a divisor of k; furthermore the digit 1 is allowed only when k has no other divisors < 10. |
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+0
5
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| 2, 3, 5, 7, 23, 29, 41, 43, 47, 61, 67, 83, 89, 347, 349, 367, 383, 389, 641, 643, 647, 661, 683, 929, 941, 947, 967, 983, 2341, 2347, 2381, 2383, 2389, 2621, 2647, 2663, 2683, 2687, 2689, 2927, 2963, 2969, 4327, 4349, 4363, 4621, 4643, 4649, 4663, 4943
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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The prime 52627 is a member because 7 is a multiple of 1, 2
is a multiple of 2, 6 is a multiple of 3, 2 is a divisor of 4 and 5 is a multiple of 5.
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CROSSREFS
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Cf. A008364.
Sequence in context: A030144 A156756 A068690 this_sequence A113611 A038925 A154761
Adjacent sequences: A069553 A069554 A069555 this_sequence A069557 A069558 A069559
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KEYWORD
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base,nonn,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 22 2002
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EXTENSIONS
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Edited by David Wasserman (wasserma(AT)spawar.navy.mil), Nov 03 2005
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