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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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9
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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; refs; listen; history; internal format)
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OFFSET
| 1,41
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EXAMPLE
| See the example in A069842.
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MATHEMATICA
| 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
| Cf. A069842, A069844, A069845, A069846, A069847, A069848, A069849, A069850 and A069851.
Sequence in context: A173667 A086008 A083910 * A069849 A138045 A004530
Adjacent sequences: A069840 A069841 A069842 * A069844 A069845 A069846
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 16 2002
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EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2002
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