A109989 4-almost primes (A014613) ordered alphabetically by where they occur in A000052.

88, 84, 81, 54, 56, 40, 90

Offset

1,1

Comments

A109986 is primes ordered alphabetically by where they occur in A000052. A109987 is semiprimes 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..7.

Example

a(1) = 88 because eighty-eight is the first 4-almost prime in alphabetical order, there being no 1-digit 4-almost primes.
a(2) = 84 because eighty-four is the second 2-digit 4-almost prime in alphabetical order.

Crossrefs

Cf. A000052, A014613, A109986, A109987, A109988.

Sequence in context: A033408 A298452 A299526 * A239154 A181469 A147317

Adjacent sequences: A109986 A109987 A109988 * A109990 A109991 A109992

Keyword

base,easy,nonn,word

Author

Jonathan Vos Post, Jul 07 2005

Status

approved