The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A167860 Primes p dividing every A167859(m) from m=(p-1)/2 to m=(p-1). 4
 7, 47, 191, 383, 439, 1151, 1399, 2351, 2879, 3119, 3511, 3559 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Apparently A167860 is a subset of primes of the form 8n+7 (A007522). A167859(n) = 4^n*Sum_{ k=0..n } ((binomial(2*k,k))^2)/4^k. Every A167859(m) from m=(p-1)/2 to m=(p-1) is divisible by prime p belonging to A167860. 7^3 divides A167859(13) and 7^2 divides A167859(10)-A167859(13). Every A167859(m) from m=(kp-1 - (p-1)/2) to m=(kp-1) is divisible by prime p from A167860. Every A167859(m) from m=((p^2-1)/2) to m=(p^2-1) is divisible by prime p from A167860. For p=7 every A167859(m) from m=((p^3-1)/2) to m=(p^3-1) and from m=((p^4-1)/2) to m(p^4-1)is divisible by p^2. LINKS CROSSREFS Cf. A000984, A066796, A006134, A082590, A132310, A002457, A144635, A167713, A167859, A007522. Sequence in context: A142185 A158914 A046872 * A152988 A201437 A202509 Adjacent sequences:  A167857 A167858 A167859 * A167861 A167862 A167863 KEYWORD more,nonn AUTHOR Alexander Adamchuk, Nov 13 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 27 12:01 EST 2020. Contains 331295 sequences. (Running on oeis4.)