OFFSET
1,1
LINKS
Robert G. Wilson v, Table of n, a(n) for n = 1..276
EXAMPLE
MATHEMATICA
f[n_] := Block[{p = Prime@ n}, q = 1 + 2p; While[ !PrimeQ@ q, q += 2p]; (q - 1)/p]; f[1] = 1; t = Table[0, {1000}]; k = 2; While[k < 1000000001, a = f@ k /2; If[ t[[a]] == 0, t[[a]] = k; Print[{a, k}]]; k++]]; t
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Dec 28 2014
STATUS
approved