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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A176507 Indices of products of 2 single (or isolated or non-twin) primes in the composites. 0 1, 31, 52, 69, 78, 101, 120, 127, 137, 149, 177, 199, 206, 248, 259, 266, 277, 339, 359, 375, 406, 416, 426, 429, 452, 479, 501, 518, 540, 551, 579, 590, 603, 613, 623, 630, 640, 655, 662, 676, 704, 726, 732, 743, 757, 775, 795, 809, 816, 829, 837, 847, 900 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 LINKS Table of n, a(n) for n=1..53. FORMULA A002808(k)=A176312(a(n)). CROSSREFS Sequence in context: A068779 A068473 A275628 * A163321 A182380 A141856 Adjacent sequences: A176504 A176505 A176506 * A176508 A176509 A176510 KEYWORD nonn AUTHOR Juri-Stepan Gerasimov, Apr 19 2010 EXTENSIONS Corrected (553 replaced by 551) by R. J. Mathar, May 02 2010 STATUS approved

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Last modified August 18 11:13 EDT 2024. Contains 375265 sequences. (Running on oeis4.)