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A090414 Triangular array read by rows, 1<=k<=n: T(n,k) = smallest prime that in binary representation is not contained in n^k. 2
2, 3, 3, 2, 3, 7, 3, 3, 3, 3, 3, 5, 11, 5, 7, 5, 3, 7, 3, 5, 7, 2, 5, 13, 7, 11, 13, 17, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 7, 11, 19, 19, 17, 13, 3, 5, 11, 5, 7, 11, 7, 17, 17, 13, 7, 5, 7, 5, 23, 7, 13, 7, 7, 17, 17, 5, 3, 7, 3, 5, 7, 7, 7, 5, 11, 17, 19 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Triangle begins:
2;
3, 3;
2, 3, 7;
3, 3, 3, 3;
3, 5, 11, 5, 7;
5, 3, 7, 3, 5, 7;
2, 5, 13, 7, 11, 13, 17;
..
PROG
(PARI) T(n, k) = {my(d=binary(n^k), v); forprime(p=2, oo, v=binary(p); if(#v>#d || sum(i=1, #d-#v+1, v==vector(#v, j, d[i+j-1]))==0, return(p))); } \\ Jinyuan Wang, Mar 01 2020
CROSSREFS
Sequence in context: A141744 A089783 A302939 * A068227 A235343 A236456
KEYWORD
nonn,base,tabl
AUTHOR
Reinhard Zumkeller, Nov 30 2003
EXTENSIONS
More terms from Jinyuan Wang, Mar 01 2020
STATUS
approved

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Last modified March 29 08:49 EDT 2024. Contains 371268 sequences. (Running on oeis4.)