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A027883 Positions of primes in sequence (A246655) of primes and prime powers {p^i, i >= 1}. 7
1, 2, 4, 5, 8, 9, 11, 12, 13, 16, 17, 19, 20, 21, 22, 24, 25, 26, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 43, 45, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83, 84, 85, 87, 88, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A024620(n) - 1.
CROSSREFS
Sequence in context: A277075 A038558 A286031 * A201818 A047380 A288214
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Erich Friedman.
Name clarified by Ilya Gutkovskiy, Mar 12 2020
STATUS
approved

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Last modified June 23 22:09 EDT 2024. Contains 373661 sequences. (Running on oeis4.)