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A097208
a(n) is the least k such that A098598(k) = n.
0
40, 24, 19, 17, 16, 10, 23, 21, 92, 313, 155, 551, 2575, 757, 13537, 5525, 35133, 33953, 332975, 355573, 3157535, 1571573, 2732737, 3775555, 5737571, 37332775
OFFSET
0,1
COMMENTS
a(27) = 75787577. No more terms < 10^8. - David Wasserman, Dec 27 2007
EXAMPLE
a(3)=17 because it is the least number that contains 3 primes in the sequence 1,7,8,15,23,38,61,99,160,259.
MATHEMATICA
f[n_] := Block[{id = IntegerDigits[n], t = Floor[ Log[10, n] + 1], b}, Do[ b[i] = id[[i]], {i, t}]; b[i_] := b[i] = Plus @@ Table[b[i - j], {j, t}]; k = t + 1; While[b[k] < n^2, k++ ]; Count[ PrimeQ[ Table[b[i], {i, k - 1}]], True]]; t = Table[0, {50}]; Do[c = f[n]; If[ t[[c + 1]] == 0, t[[c + 1]] = n; Print[c, " = ", n]], {n, 10, 12000000}]; t (* Robert G. Wilson v, Oct 07 2004 *)
CROSSREFS
Cf. A098598.
Sequence in context: A033360 A370402 A029543 * A216137 A163956 A229661
KEYWORD
base,nonn,more
AUTHOR
Jason Earls, Sep 17 2004
EXTENSIONS
Corrected and extended by Robert G. Wilson v, Oct 07 2004
a(25), a(27) and better definition from David Wasserman, Dec 27 2007
STATUS
approved