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Search: id:A069843
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| A069843 |
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Number of distinct primes obtained by inserting a 2 at all possible places in n. This includes prefixing. |
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+0
10
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| 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, 0, 0, 0, 1, 0, 0, 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, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 0
(list; graph; listen)
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OFFSET
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1,41
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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], 2, j], {j, 1, Floor[ Log[10, n] + 2]}]]], True], {n, 1, 105}]
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CROSSREFS
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Cf. A069842, A069844, A069845, A069846, A069847, A069848, A069849, A069850 and A069851.
Sequence in context: A024155 A086008 A083910 this_sequence A069849 A138045 A004530
Adjacent sequences: A069840 A069841 A069842 this_sequence A069844 A069845 A069846
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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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