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A174801 Prime(n)+1 is prime or semiprime. 1
1, 2, 3, 6, 12, 18, 21, 37, 44, 59, 65, 78, 82, 88, 100, 112, 121, 122, 130, 134, 151, 168, 183, 191, 197, 198, 203, 216, 221, 231, 257, 260, 273, 287, 295, 301, 306, 322, 347, 366, 375, 378, 407, 415, 422, 438, 455, 459, 466, 491, 521, 556, 560, 574, 585, 587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

a(1)=1 because prime(1)+1=3=prime; a(2)=2 because prime(2)+1=4=semiprime; a(3)=3 because prime(3)+1=6=semiprime; a(4)=6 because prime(6)+1=14=semiprime.

CROSSREFS

Cf. A000040, A001358.

Sequence in context: A125867 A032727 A323392 * A324177 A280681 A328899

Adjacent sequences:  A174798 A174799 A174800 * A174802 A174803 A174804

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Mar 29 2010

EXTENSIONS

Extended by Ray Chandler, Apr 06 2010

STATUS

approved

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)