|
Search: id:A030430
|
|
| |
|
| 11, 31, 41, 61, 71, 101, 131, 151, 181, 191, 211, 241, 251, 271, 281, 311, 331, 401, 421, 431, 461, 491, 521, 541, 571, 601, 631, 641, 661, 691, 701, 751, 761, 811, 821, 881, 911, 941, 971, 991, 1021, 1031, 1051, 1061, 1091, 1151, 1171, 1181, 1201, 1231, 1291
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Also primes of form 5n+1 or equivalently 5n+6.
Primes p such that the arithmetic mean of divisors of p^4 is an integer : A000203(p^4)/A000005(p^4) = C. [From Ctibor O. Zizka (c.zizka(AT)email.cz), Sep 15 2008]
Contribution from Tito Piezas III (tpiezas(AT)gmail.com), Dec 28 2008: (Start)
Being a subset of A141158, this is also a subset of the primes of form x^2-5y^2.
(End)
All primes belong second column [A144562] [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 13 2009]
Primes p such that arithmetic mean of divisors of p^4 is an integer. [From Ctibor O. Zizka (c.zizka(AT)email.cz), Oct 20 2009]
|
|
LINKS
|
A. Granville and G. Martin, Prime number races
|
|
FORMULA
|
a(n) = 10*A024912(n+1)+1 = 5*A081759(n)+6.
Union of A132230 and A132232. [From Ray Chandler (rayjchandler(AT)sbcglobal.net), Apr 07 2009]
|
|
MATHEMATICA
|
Select[Prime@Range[210], Mod[ #, 10] == 1 &] (*Chandler*)
|
|
CROSSREFS
|
Cf. A024912, A045453, A049511, A081759.
Cf. A104146(floor(a(n)/10)) = 1.
Cf. A144562, A067076, A153238 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 13 2009]
Sequence in context: A038351 A068871 A004615 this_sequence A059313 A040975 A040172
Adjacent sequences: A030427 A030428 A030429 this_sequence A030431 A030432 A030433
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Warut Roonguthai (warut822(AT)yahoo.com)
|
|
|
Search completed in 0.006 seconds
|
