A131426 - OEIS

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A131426

a(n) = 2*prime(n) - 3.

1, 3, 7, 11, 19, 23, 31, 35, 43, 55, 59, 71, 79, 83, 91, 103, 115, 119, 131, 139, 143, 155, 163, 175, 191, 199, 203, 211, 215, 223, 251, 259, 271, 275, 295, 299, 311, 323, 331, 343, 355, 359, 379, 383, 391, 395, 419, 443, 451, 455, 463, 475, 479, 499, 511, 523, 535, 539, 551, 559, 563, 583, 611

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

OFFSET

1,2

COMMENTS

Right border of triangle A131424.

LINKS

Table of n, a(n) for n=1..63.

FORMULA

a(n) = 2*A000040(n) - 3.

EXAMPLE

a(4) = 11 = 2*p(4) - 3 = 2*7 - 3.

MAPLE