A114975 Numbers k such that 11^k + k^11 is semiprime.

6, 10, 16, 24, 26, 48, 63

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Example

6 is a term because 11^6 + 6^11 = 1771561 + 362797056 = 364568617 = 7*52081231 is a semiprime.

Prog

(Magma) IsSemiprime:=func< n | &+[ k[2]: k in Factorization(n) ] eq 2 >; [ n: n in [1..70]|IsSemiprime(11^n+n^11)]; // Vincenzo Librandi, Dec 16 2010

Crossrefs

Cf. A001358.

Sequence in context: A315349 A315350 A340773 * A230276 A079329 A302748

Adjacent sequences: A114972 A114973 A114974 * A114976 A114977 A114978

Keyword

nonn,more

Author

Zak Seidov, Feb 22 2006

Status

approved