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 A065525 The (6^n)-th composite number. 0
 4, 12, 52, 275, 1539, 8883, 51974, 306464, 1815791, 10791313, 64266028, 383289080, 2288430270, 13674181949, 81759268145, 489087871679, 2926904894187, 17521456528700, 104917324472297, 628377368081285, 3764220848092978, 22552713068921032, 135139349515525416 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a[n] = PrimePi[a[n]]+6^n+1. EXAMPLE a[4] = 1539 = PrimePi[1539]+6^4+1 = 242+1296+1. MATHEMATICA Composite[n_Integer] := Block[ {k = n + PrimePi[n] + 1 }, While[ k != n + PrimePi[k] + 1, k = n + PrimePi[k] + 1]; Return[ k ]]; Table[ Composite[6^n], {n, 0, 17} ] CROSSREFS Sequence in context: A034716 A129841 A277431 * A317281 A190342 A262745 Adjacent sequences: A065522 A065523 A065524 * A065526 A065527 A065528 KEYWORD nonn AUTHOR Robert G. Wilson v, Nov 27 2001 EXTENSIONS Corrected by Vladeta Jovovic, Dec 10 2001 a(18)-a(22) from Chai Wah Wu, Apr 21 2018 STATUS approved

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Last modified December 4 09:27 EST 2022. Contains 358556 sequences. (Running on oeis4.)