[seqfan] tau and sigma

[юрий герасимов]

Dear SeqFans,

919, 13333097, 13358407, 70779463, 105125921, 110495719, 292840063, 321860263, 415520359, 617684959, 628112717, 993590681,...

--> primes p satisfyng tau(p + 1) = tau(p - 1) and sigma(p + 1) = sigma(p - 1); 

53, 20543, 47843, 32003407, 59808803, 96144127, 113561243, 238818893, 1020720293, ...

--> primes p satisfyng tau(p + 2) = tau(p - 2) and sigma(p + 2) = sigma(p - 2).

1-th sequence or 2-th sequence is of general interest?

Thanks. JSG.