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 A333721 Numbers k such that k + 1, 2k + 1, 3k + 1, 4k + 1, and 6k + 1 are all prime. 1
 1530, 4260, 25410, 26040, 78540, 111720, 174990, 211050, 214830, 395430, 403260, 409290, 459690, 487830, 512820, 711120, 779790, 910560, 1023750, 1135950, 1280370, 1312350, 1451520, 1464810, 1487070, 1563510, 1623360, 1698060, 1824330, 1933680, 2006340, 2097480 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are multiples of 6. All terms are multiples of 30. - Robert Israel, Jun 17 2020 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 Pedro Caceres, 30 Ideas about Prime Numbers EXAMPLE 25410 is in the sequence because 25411, 50821, 76231, 101641, 152461 are all prime. MAPLE select(t -> andmap(isprime, [t+1, 2*t+1, 3*t+1, 4*t+1, 6*t+1]), [seq(i, i=30..3*10^6, 30)]); # Robert Israel, Jun 17 2020 PROG (PARI) isok(m)={for(i=1, 6, if(i<>5&&!isprime(i*m+1), return(0))); 1} { forstep(n=0, 3*10^6, 6, if(isok(n), print1(n, ", "))) } \\ Andrew Howroyd, May 04 2020 CROSSREFS Cf. A006093, A005097, A024892, A087370, A005098, A005099, A024898, A024899. Sequence in context: A226701 A235170 A252414 * A030061 A122707 A347200 Adjacent sequences: A333718 A333719 A333720 * A333722 A333723 A333724 KEYWORD nonn AUTHOR Pedro Caceres, May 04 2020 STATUS approved

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Last modified September 30 09:43 EDT 2023. Contains 365784 sequences. (Running on oeis4.)