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A084726
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Smallest common difference of the arithmetic progression of length n, beginning with 1 whose product of first n terms + 1 is a prime.
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1
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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; internal format)
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OFFSET
| 1,4
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COMMENTS
| Obviously all the terms are odd.
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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
...
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CROSSREFS
| Cf. A084727.
Sequence in context: A200285 A205528 A021731 * A107738 A010624 A019638
Adjacent sequences: A084723 A084724 A084725 * A084727 A084728 A084729
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jun 13 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jan 03 2005
Example triangle corrected by Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Jun 25 2011
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