|
Search: id:A110096
|
|
|
| A110096 |
|
Least positive integer which, when added to each of 2^1, ..., 2^n, yields all primes. (If none exists, define the term to be 0.). |
|
+0
1
|
|
| 1, 1, 3, 3, 15, 15, 1605, 1605, 19425, 2397347205, 153535525935, 29503289812425, 29503289812425
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
EXAMPLE
|
a(5)=15 is the least positive integer which, when added to 2^1, 2^2, 2^3, 2^4, 2^5, yields all primes: 17, 19, 23, 31, 47.
|
|
MATHEMATICA
|
p[n_] := Table[2^i, {i, 1, n}]; f[k_, n_] := MemberQ[PrimeQ[k + p[n]], False]; r = {}; For[n = 1, n <= 9, n++, k = 1; While[f[k, n], k = k + 1]; r = Append[r, k]]; r
|
|
CROSSREFS
|
Sequence in context: A129356 A055634 A133221 this_sequence A157526 A153512 A127328
Adjacent sequences: A110093 A110094 A110095 this_sequence A110097 A110098 A110099
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 05 2005
|
|
EXTENSIONS
|
2397347205 from T. D. Noe (noe(AT)sspectra.com), Sep 06 2005
a(11) from Don Reble (djr(AT)nk.ca), Sep 17 2005
|
|
|
Search completed in 0.002 seconds
|
