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A078782 Nonprimes (A018252) with prime (A000040) subscripts. 14
4, 6, 9, 12, 18, 21, 26, 28, 34, 42, 45, 52, 57, 60, 65, 74, 81, 84, 91, 95, 98, 106, 112, 119, 128, 133, 135, 141, 143, 147, 165, 170, 177, 180, 192, 195, 203, 209, 214, 220, 228, 231, 244, 246, 250, 253, 267, 284, 288, 290, 295, 301, 303, 316, 323, 329, 336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A018252(A000040(n)). Subsequence of A175250 (nonprimes (A018252) with noncomposite (A008578) subscripts), a(n) = A175250(n+1). a(n) U A102615(n) = A018252(n). [From Jaroslav Krizek, Mar 13 2010]

LINKS

Table of n, a(n) for n=1..57.

EXAMPLE

a(4) = nonprime(prime(4)) = nonprime(7) = 12.

CROSSREFS

Let A = primes A000040, B = nonprimes A018252. The 2-level compounds are AA = A006450, AB = A007821, BA = A078782, BB = A102615. The 3-level compounds AAA, AAB, ..., BBB are A038580, A049078, A270792, A102617, A270794, A270796, A102216.

Sequence in context: A310670 A088765 A175250 * A165897 A020165 A110607

Adjacent sequences:  A078779 A078780 A078781 * A078783 A078784 A078785

KEYWORD

easy,nonn

AUTHOR

Joseph L. Pe, Jan 09 2003

EXTENSIONS

Corrected by Jaroslav Krizek, Mar 13 2010

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)