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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, 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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)