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A277730 Irregular triangle read by rows: T(n,k) = number of times a gap of 2k occurs between the first n successive odd primes. 2
1, 2, 2, 1, 3, 1, 3, 2, 4, 2, 4, 3, 4, 3, 1, 5, 3, 1, 5, 3, 2, 5, 4, 2, 6, 4, 2, 6, 5, 2, 6, 5, 3, 6, 5, 4, 7, 5, 4, 7, 5, 5, 7, 6, 5, 8, 6, 5, 8, 6, 6, 8, 7, 6, 8, 7, 7, 8, 7, 7, 1, 8, 8, 7, 1, 9, 8, 7, 1, 9, 9, 7, 1, 10, 9, 7, 1, 10, 10, 7, 1, 10, 10, 7, 1, 0, 0, 1, 10, 11, 7, 1, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Lars Blomberg, Table of n, a(n) for n = 2..9997 (the first 703 rows)

EXAMPLE

Triangle begins:

1,

2,

2, 1,

3, 1, <- gaps in 3,5,7,11,13 are 2 (3 times), 4 (once)

3, 2,

4, 2,

4, 3,

4, 3, 1,

5, 3, 1,

5, 3, 2,

5, 4, 2,

6, 4, 2,

6, 5, 2,

6, 5, 3,

6, 5, 4,

7, 5, 4,

7, 5, 5,

7, 6, 5,

8, 6, 5,

...

CROSSREFS

Cf. A277729, A213930.

Sequence in context: A340985 A259176 A237591 * A174167 A159876 A173493

Adjacent sequences:  A277727 A277728 A277729 * A277731 A277732 A277733

KEYWORD

nonn,look,tabf

AUTHOR

N. J. A. Sloane, Nov 06 2016

STATUS

approved

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Last modified January 23 16:29 EST 2022. Contains 350514 sequences. (Running on oeis4.)