A109986 Primes ordered alphabetically by where they occur in A000052.

5, 7, 3, 2, 89, 83, 11, 59, 53, 41, 47, 43, 19, 97, 17, 79, 71, 73, 61, 67, 13, 31, 37, 29, 23, 881, 887, 883, 811, 859, 857, 853, 809, 877, 863, 839, 829, 821, 827, 823, 587, 557, 541, 547, 509, 599, 593, 571, 577, 569, 563, 503, 521, 523, 487, 457, 449, 443

Offset

1,1

Comments

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

Robert Israel, Table of n, a(n) for n = 1..10000

Example

a(1) = 5 because five is the first prime in alphabetical order.
a(5) = 89 because eighty-nine is the first 2-digit prime in alphabetical order.

Maple

V:= [seq(select(isprime, [$10^i..10^(i+1)-1]), i=0..3)]:
seq(op(V[i][sort(map(convert, V[i], english, 'And'),
output=permutation)]), i=1..nops(V)); # Robert Israel, Jun 17 2016

Mathematica

alph = Last /@ Import["https://oeis.org/A000052/b000052.txt", "Table"]; Take[
Select[alph, PrimeQ], 58] (* Giovanni Resta, Jun 17 2016 *)

Crossrefs

Cf. A000040, A000052, A109987, A109988.

Sequence in context: A155158 A344111 A241140 * A245741 A175473 A180079

Adjacent sequences: A109983 A109984 A109985 * A109987 A109988 A109989

Keyword

base,easy,nonn,word

Author

Jonathan Vos Post, Jul 07 2005

Extensions

Corrected and extended by Giovanni Resta, Jun 17 2016

Status

approved