A081949 Smallest square which is one more than the product of n (not necessarily distinct) numbers > 1.

4, 9, 9, 25, 49, 225, 289, 961, 4225, 16129, 16129, 201601, 261121, 1050625, 1050625, 62995969, 67092481, 67092481, 67092481, 822140929, 4295098369, 17179607041, 129923481601, 129923481601, 274876858369, 274876858369, 4398042316801

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Example

a(2) = a(3) = 9 = 2*4+1 = 2*2*2 +1,a(6) = 225= 2*2*2*2*2*7 +1

Prog

(PARI) A = vector(30); count = 0; i = 1; while(count < 30, i = i + 1; n = i*i; k = bigomega(n - 1); while(count < k, count = count + 1; A[count] = n))

Crossrefs

Cf. A081948.

Sequence in context: A095873 A141801 A177083 * A091657 A156047 A171001

Adjacent sequences: A081946 A081947 A081948 * A081950 A081951 A081952

Keyword

nonn

Author

Amarnath Murthy, Apr 02 2003

Extensions

More terms from David Wasserman, Jul 20 2004

Status

approved