A081948 Smallest square which is one more than the product of n distinct numbers > 1.

4, 9, 25, 121, 841, 5041, 143641, 776161, 9480241, 143256961, 6737290561, 23436241921, 624730579201, 19416369772801, 783641696947201, 14009922630063361, 1198720173566361601, 15006677013199872001, 1253712178399830589441, 4817356462173265920001

Offset

1,1

Links

Martin Fuller, Table of n, a(n) for n = 1..24

Martin Fuller, PARI program

Example

a(3) = 25 = 2*3*4 + 1;
a(15) = 783641696947201 = 2*3*4*5*6*7*8*9*12*13*14*15*21*43*73 + 1. - Sean A. Irvine, Nov 18 2025

Prog

(PARI) \\ See Fuller link.

Crossrefs

Cf. A081949.

Sequence in context: A055851 A025494 A087374 * A191273 A087361 A340642

Adjacent sequences: A081945 A081946 A081947 * A081949 A081950 A081951

Keyword

nonn

Author

Amarnath Murthy, Apr 02 2003

Extensions

a(7)-a(17) from Donovan Johnson, Aug 31 2008

a(15) corrected by Sean A. Irvine, Nov 18 2025

a(18) onward from Martin Fuller, Nov 23 2025

Status

approved