

A129250


Primes of ErdosSelfridge class 16.


2



22111003847, 25782283783, 34824831403, 42970472971, 44905511759, 45490491349, 52486961911, 54560052479, 55437374381, 65803884467, 66333011539
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OFFSET

1,1


COMMENTS

Knowledge of a[k],k=1..9 allows us to establish A056637[17]=1+2*a[9]=110874748763.


LINKS

Table of n, a(n) for n=1..11.


FORMULA

{ a(n) } = { p=1+2*k*A129249[n] ; n=1,2,3..., k=1,2,3... such that p is prime and k has no factor of class > 15 }


PROG

(PARI) nextclass( a, s=1, p, n=[] )={ if( !p, p=nextprime(a[ #a]+1)); print("Computing all primes of next class up to ", 2*ps ); for( i=1, #a, for( k=1, p/a[i], if( is/*pseudo*/prime(2*k*a[i]s), n=concat(n, 2*k*a[i]s); ) ) ); vecsort(n) }; A129250=nextclass(A129249)


CROSSREFS

Cf. A056637, A081640, A081641, A129248, A129249.
Sequence in context: A119478 A101816 A186910 * A216398 A121841 A306503
Adjacent sequences: A129247 A129248 A129249 * A129251 A129252 A129253


KEYWORD

more,nonn


AUTHOR

M. F. Hasler, Apr 21 2007


STATUS

approved



