A109987 Semiprimes ordered alphabetically by where they occur in A000052.

4, 9, 6, 85, 87, 86, 82, 15, 58, 55, 51, 57, 49, 46, 14, 95, 94, 91, 93, 74, 77

Offset

1,1

Comments

A109986 is primes ordered alphabetically by where they occur in A000052. A109988 is 3-almost primes ordered alphabetically by where they occur in A000052.

Links

Table of n, a(n) for n=1..21.

Example

a(1) = 4 because four is the first semiprime in alphabetical order.
a(4) = 85 because eighty-five is the first 2-digit semiprime in alphabetical order.

Crossrefs

Cf. A000052, A001358, A109986, A109988.

Sequence in context: A083717 A332451 A130041 * A021672 A278810 A176426

Adjacent sequences: A109984 A109985 A109986 * A109988 A109989 A109990

Keyword

base,easy,nonn,word

Author

Jonathan Vos Post, Jul 07 2005

Status

approved