A174801 Prime(n)+1 is prime or semiprime.

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

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