A089307 Smallest prime of the form 1+n*(n+n_2)*...*(n+n_n) with 1<=n_2<n_3<...<n_n. A089308 gives terms of products.

2, 7, 61, 1201, 15121, 332641, 9313921, 319334401, 10897286401, 419026608001, 14079294028801, 647647525324801, 34972966367539201, 2017671136588800001, 108416195739371520001, 6707348643075784704001, 440955772120958814720001

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

a(4)=1201 because 1201 is the smallest prime that can be written as 1 + product of 4 strictly increasing terms and smallest term 4: 1201=1+4*5*6*10.

Crossrefs

Cf. A089308.

Sequence in context: A046846 A111010 A363655 * A367902 A102896 A088107

Adjacent sequences: A089304 A089305 A089306 * A089308 A089309 A089310

Keyword

nonn

Author

Amarnath Murthy, Nov 01 2003

Extensions

More terms from Hugo Pfoertner, Apr 06 2004

Further terms from David Wasserman, Sep 09 2005

Status

approved