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 A332797 Numbers whose smallest prime factor is 23. 5
 23, 529, 667, 713, 851, 943, 989, 1081, 1219, 1357, 1403, 1541, 1633, 1679, 1817, 1909, 2047, 2231, 2323, 2369, 2461, 2507, 2599, 2921, 3013, 3151, 3197, 3427, 3473, 3611, 3749, 3841, 3979, 4117, 4163, 4393, 4439, 4531, 4577, 4853, 5129, 5221, 5267, 5359, 5497 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES Emmanuel Desurvire, Classical and Quantum Information Theory: An Introduction for the Telecom Scientist, Cambridge University Press, 2009, table 20.5 p. 421. LINKS FORMULA a(n) = 23*A166063(n). EXAMPLE a(2) = 23*23, a(3) = 23*29. MATHEMATICA 23 * Select[Range[240], CoprimeQ[#, 9699690] &] (* Amiram Eldar, Feb 24 2020 *) PROG (REXX) P = 23         ;  S = P do N = P by 2 while length( S ) < 255    do I = 1 until P = X       X = PRIME( I )       if P = X       then  leave I       if N // X = 0  then  iterate N    end I    S = S || ', ' P*N end N say S          ;  return S CROSSREFS Cf. A084967 (5), A084968 (7), A084969 (11), A084970 (13), A332799 (17), A332798 (19), A166063 (23-rough numbers). Sequence in context: A118338 A171328 A097778 * A057193 A014960 A207230 Adjacent sequences:  A332794 A332795 A332796 * A332798 A332799 A332800 KEYWORD nonn,easy AUTHOR Frank Ellermann, Feb 24 2020 STATUS approved

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Last modified October 27 23:26 EDT 2020. Contains 338047 sequences. (Running on oeis4.)