|
Search: id:A141427
|
|
| |
|
| 1, 4, 10, 16, 22, 28, 30, 40, 46, 52, 58, 60, 70, 72, 82, 88, 100, 106, 112, 130, 136, 138, 148, 150, 156, 166, 172, 178, 180, 190, 196, 198, 210, 226, 232, 238, 240, 250, 256, 262, 268, 270, 280, 282, 292, 310, 316, 330, 336, 346, 352, 358, 366, 372, 382, 388
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Count of numbers smaller than and coprime to p for primes p such that p + 4 is composite.
Subsequence of A006093.
|
|
PROGRAM
|
(PARI) {forprime(p=2, 400, if(!isprime(p+4), print1(eulerphi(p), ", ")))} [From Klaus Brockhaus, Aug 31 2008]
|
|
CROSSREFS
|
Cf. A067775, A000010 (Euler totient function), A006093 (primes minus 1), A141426, A141515.
Sequence in context: A081260 A043385 A140493 this_sequence A016957 A109273 A161644
Adjacent sequences: A141424 A141425 A141426 this_sequence A141428 A141429 A141430
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Aug 06 2008
|
|
EXTENSIONS
|
More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 18 2008
Edited by N. J. A. Sloane (njas(AT)research.att.com) and Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 31 2008
|
|
|
Search completed in 0.002 seconds
|
