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Search: id:A069558
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| A069558 |
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Triangular numbers in which the k-th significant digit either divides k or is a multiple of k. Is 1 only in case k has no other single digit divisor (Less than 10). |
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3
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| 1, 3, 6, 21, 28, 45, 66, 325, 666, 946, 2346, 2628, 2926, 8385, 8646, 52326, 54946
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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If the smallest prime divisor of n is > 7 only in such case the n-th digit is 1.
Next Term > 10^18 - Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 23 2002
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EXAMPLE
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8646 is a member in which the fourth digit is 8 a multiple of 4, the third one is 6 a multiple of 3, the second one is 4 a multiple of 2 and the least significant digit is 6.
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CROSSREFS
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Cf. A069556, A069557.
Sequence in context: A064366 A101719 A101582 this_sequence A050611 A056499 A056489
Adjacent sequences: A069555 A069556 A069557 this_sequence A069559 A069560 A069561
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KEYWORD
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base,hard,more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 22 2002
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