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A117752
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Number of prime 3-digit palindromes in base n.
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0
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2, 2, 3, 5, 6, 6, 13, 13, 15, 21, 20, 26, 25, 30, 36, 30, 37, 44, 50, 42, 59, 60, 61, 71, 75, 68, 89, 93, 109, 100, 111, 113, 118, 120, 133, 134, 142, 155, 162, 154, 166, 168, 187, 194, 220, 195, 207, 212, 235, 210, 243, 263, 247, 257, 293, 286, 296, 320, 304, 328
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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COMMENTS
| Is there a proof that a(n) > 0?
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PROG
| (PARI) a(n)=local(t, i, j); t=0; for(i=1, n-1, for(j=0, n-1, if(isprime(i*(n^2+1)+j*n), t++))); t
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CROSSREFS
| Cf. A060873.
Sequence in context: A051732 A098382 A098180 * A172992 A006065 A096981
Adjacent sequences: A117749 A117750 A117751 * A117753 A117754 A117755
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KEYWORD
| base,nonn
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AUTHOR
| Frank Adams-Watters (FrankTAW(AT)Netscape.net), Apr 14 2006
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