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 A136153 Composites one larger than a prime, with exactly four distinct prime factors. 5
 390, 420, 462, 510, 570, 660, 770, 798, 840, 858, 930, 1020, 1050, 1092, 1110, 1218, 1230, 1260, 1290, 1302, 1320, 1410, 1428, 1430, 1482, 1554, 1560, 1610, 1638, 1710, 1722, 1848, 1890, 1914, 1932, 1950, 1974, 1980, 2030, 2040, 2070, 2090, 2100, 2130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..2000 FORMULA Equals A008864 INTERSECT A033993. - R. J. Mathar, Feb 20 2008 EXAMPLE a(0)=390 because 30 follows the prime 29 and has four prime factors 2, 3, 5 and 13. MATHEMATICA Select[Prime[Range[400]]+1, PrimeNu[#]==4&] (* Harvey P. Dale, Aug 15 2021 *) PROG (PARI) isok(n) = (omega(n)==4) && isprime(n-1); \\ Michel Marcus, Jun 08 2014 CROSSREFS Cf. A136151, A136152, A136154, A136155. Sequence in context: A300340 A228580 A242182 * A069477 A325993 A108573 Adjacent sequences: A136150 A136151 A136152 * A136154 A136155 A136156 KEYWORD easy,nonn AUTHOR Enoch Haga, Dec 16 2007 EXTENSIONS Edited by R. J. Mathar, Feb 20 2008 STATUS approved

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Last modified December 1 14:09 EST 2023. Contains 367476 sequences. (Running on oeis4.)