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 A165974 Irregular triangle read by rows: floor(j^2 / p) for p prime and j = 1 to p-1. 12
 0, 0, 1, 0, 0, 1, 3, 0, 0, 1, 2, 3, 5, 0, 0, 0, 1, 2, 3, 4, 5, 7, 9, 0, 0, 0, 1, 1, 2, 3, 4, 6, 7, 9, 11, 0, 0, 0, 0, 1, 2, 2, 3, 4, 5, 7, 8, 9, 11, 13, 15, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 15, 17, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 14, 15, 17, 19, 21 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS The irregular triangle of numbers is: ....j..1..2..3..4..5..6..7..8..9.10.11.12.13.14.15.16.17.18.19.20.21.22 ..p ..2....0 ..3....0..1 ..5....0..0..1..3 ..7....0..0..1..2..3..5 .11....0..0..0..1..2..3..4..5..7..9 .13....0..0..0..1..1..2..3..4..6..7..9.11 .17....0..0..0..0..1..2..2..3..4..5..7..8..9.11.13.15 .19....0..0..0..0..1..1..2..3..4..5..6..7..8.10.11.13.15.17 .23....0..0..0..0..1..1..2..2..3..4..5..6..7..8..9.11.12.14.15.17.19.21 LINKS C. H. Gribble, Flattened irregular triangle read by rows of primes < 300 CROSSREFS Cf. A165993 (row sums). Sequence in context: A151859 A163541 A280815 * A090622 A035696 A170840 Adjacent sequences: A165971 A165972 A165973 * A165975 A165976 A165977 KEYWORD nonn,tabf AUTHOR Christopher Hunt Gribble, Oct 02 2009 EXTENSIONS Keyword:tabf added by R. J. Mathar, Oct 09 2009 STATUS approved

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Last modified December 4 10:32 EST 2022. Contains 358556 sequences. (Running on oeis4.)