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A174843
Irregular triangle in which row n lists the divisors of prime(n)-1.
2
1, 1, 2, 1, 2, 4, 1, 2, 3, 6, 1, 2, 5, 10, 1, 2, 3, 4, 6, 12, 1, 2, 4, 8, 16, 1, 2, 3, 6, 9, 18, 1, 2, 11, 22, 1, 2, 4, 7, 14, 28, 1, 2, 3, 5, 6, 10, 15, 30, 1, 2, 3, 4, 6, 9, 12, 18, 36, 1, 2, 4, 5, 8, 10, 20, 40, 1, 2, 3, 6, 7, 14, 21, 42, 1, 2, 23, 46, 1, 2, 4, 13, 26, 52, 1, 2, 29, 58, 1, 2, 3, 4
OFFSET
1,3
COMMENTS
Row n begins with 1, ends with prime(n)-1, and has A008328(n) terms.
MATHEMATICA
Flatten[Table[Divisors[p-1], {p, Prime[Range[100]]}]]
CROSSREFS
Sequence in context: A356184 A292477 A081532 * A253572 A141539 A340547
KEYWORD
nonn,tabf
AUTHOR
T. D. Noe, Mar 30 2010
STATUS
approved