A339630 - OEIS

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A339630

a(n) is the first number k such that there are exactly n ways to write 6*k = p + q with p a lesser twin prime (A001359) and q a greater twin prime (A006512), or 0 if there is no such k.

1, 2, 3, 4, 8, 20, 19, 80, 40, 90, 48, 270, 35, 50, 117, 140, 110, 644, 215, 714, 222, 430, 345, 350, 315, 850, 390, 930, 620, 1110, 602, 1040, 385, 2290, 590, 780, 798, 910, 735, 990, 1020, 1700, 700, 770, 595, 1760, 950, 3380, 875, 5660, 1330, 1120, 975, 5970, 1085, 2990, 1400, 3980, 1815, 4570

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

OFFSET

0,2

COMMENTS

If n is odd, a(n)/2 (if nonzero) is in A002822.

LINKS

Robert Israel, Table of n, a(n) for n = 0..1330

FORMULA

A339625(a(n)) = n if a(n) > 0.

EXAMPLE

a(4) = 8 because 6*8 = 48 can be written as p+q in exactly 4 ways: 48 = 5 + 43 = 17 + 31 = 29 + 19 = 41 + 7, and no smaller number has this property.

MAPLE