A193801 - OEIS

A193801

Semiprimes in Gica-Panaitopol recursion A193298.

4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 69, 74, 77, 82, 85, 86, 87, 91, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187, 194, 201, 202, 203, 205, 206, 237, 247

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OFFSET

1,1

COMMENTS

Gica-Panaitopol semiprimes. Numbers of the form p*q where p and q are primes, not necessarily distinct, in Gica-Panaitopol recursion: g(1) = 1; g(n+1) = 2*g(n) if g(n) <= n; otherwise g(n+1) = g(n) - 1.

LINKS

Table of n, a(n) for n=1..58.

FORMULA

A001358 INTERSECTION A193298.

CROSSREFS

Cf. A001358, A193298, A193299.

Sequence in context: A001358 A176540 A108764 * A129336 A226526 A103607

Adjacent sequences: A193798 A193799 A193800 * A193802 A193803 A193804

KEYWORD

nonn,easy

AUTHOR

Jonathan Vos Post, Aug 05 2011

STATUS

approved