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A174101 n*{2,6}+1 are both prime of form 6n+1. 0
3, 6, 18, 21, 30, 33, 51, 63, 81, 90, 96, 105, 135, 138, 153, 156, 165, 168, 186, 216, 243, 261, 270, 300, 336, 363, 375, 378, 411, 426, 441, 453, 495, 510, 531, 543, 576, 585, 606, 615, 618, 648, 651, 723, 726, 741, 765, 798, 810, 828, 831, 846, 861, 891, 930 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

a(1)=1 because 1*2+1=3=prime and 1*6+1=7=prime.

a(1)=3 because 3*2+1=7 and 3*6+1=19 are primes congruent to 1 (mod 6). [From R. J. Mathar, Apr 16 2010]

CROSSREFS

Cf. A002476, A065091.

Sequence in context: A078318 A193433 A074370 * A088339 A064400 A117863

Adjacent sequences:  A174098 A174099 A174100 * A174102 A174103 A174104

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Mar 07 2010

EXTENSIONS

More terms from R. J. Mathar, Apr 16 2010

STATUS

approved

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Last modified January 29 14:07 EST 2020. Contains 331338 sequences. (Running on oeis4.)