A084726 Smallest common difference of the arithmetic progression of length n, beginning with 1 whose product of first n terms + 1 is a prime.

1, 1, 1, 3, 7, 5, 5, 5, 7, 7, 1, 7, 11, 3, 41, 15, 21, 25, 11, 3, 69, 5, 87, 35, 17, 27, 1, 27, 5, 9, 3, 53, 9, 21, 25, 9, 1, 57, 15, 19, 1, 21, 191, 19, 25, 149, 83, 23, 7, 121, 205, 133, 185, 39, 43, 23, 9, 9, 3, 257, 109, 25, 107, 65, 19, 43, 97, 115, 197, 89, 109, 55, 1, 161, 61

Offset

1,4

Comments

Obviously all the terms are odd.

Links

Table of n, a(n) for n=1..75.

Example

The arithmetic progression in triangular form:
1
1 2
1 2 3
1 4 7 10
1 8 15 22 29
1 6 11 16 21 26
...

Crossrefs

Cf. A084727.

Sequence in context: A200285 A205528 A021731 * A107738 A341628 A238048

Adjacent sequences: A084723 A084724 A084725 * A084727 A084728 A084729

Keyword

nonn

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 13 2003

Extensions

More terms from David Wasserman, Jan 03 2005

Example triangle corrected by Nathaniel Johnston, Jun 25 2011

Status

approved