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Search: id:A069845
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| A069845 |
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Number of distinct primes obtained by inserting a 4 at all possible places in n. This includes prefixing. |
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+0
10
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| 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0
(list; graph; listen)
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OFFSET
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1,19
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EXAMPLE
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See the example in A069842.
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MATHEMATICA
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Table[ Count[ PrimeQ[ Union[ FromDigits /@ Table[ Insert[ IntegerDigits[n], 4, j], {j, 1, Floor[ Log[10, n] + 2]}]]], True], {n, 1, 105}]
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CROSSREFS
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Cf. A069842, A069843, A069844, A069846, A069847, A069848, A069849, A069850 and A069851.
Sequence in context: A091803 A123002 A137514 this_sequence A091397 A119818 A109083
Adjacent sequences: A069842 A069843 A069844 this_sequence A069846 A069847 A069848
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 16 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2002
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