A097208 a(n) is the least k such that A098598(k) = n.

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

Links

Table of n, a(n) for n=0..25.

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

Adjacent sequences: A097205 A097206 A097207 * A097209 A097210 A097211

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