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A069850
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Number of distinct primes obtained by inserting a 9 at all possible places in n. This includes prefixing as well as suffixing.
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9
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1, 1, 0, 0, 1, 0, 2, 1, 0, 1, 2, 0, 2, 1, 0, 0, 2, 0, 2, 0, 0, 1, 2, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 3, 1, 0, 1, 3, 0, 1, 1, 0, 0, 2, 0, 1, 1, 0, 0, 2, 0, 0, 1, 0, 0, 1, 0, 2, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 1, 0, 0, 1, 2, 0, 0, 1, 0, 1, 2, 0, 1, 0, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 1, 0, 0, 1, 3, 0, 3, 1, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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EXAMPLE
| See the example in A069842.
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MATHEMATICA
| Table[ Count[ PrimeQ[ Union[ FromDigits /@ Table[ Insert[ IntegerDigits[n], 9, j], {j, 1, Floor[ Log[10, n] + 2]}]]], True], {n, 1, 105}]
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CROSSREFS
| Cf. A069842, A069843, A069844, A069845, A069846, A069847, A069848, A069849 and A069851.
Sequence in context: A069842 A083056 A061896 * A141581 A179286 A193690
Adjacent sequences: A069847 A069848 A069849 * A069851 A069852 A069853
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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
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 17 2002
Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2002
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