1,1

Primes at which cusp form Delta_12 is not ordinary.

F. Q. Gouvea, Non-ordinary primes, Experimental Mathematics 6 195 1997.

J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 275.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Experimental Mathematics, Home Page

(* First do *) <<NumberTheory`Ramanujan` (* then *) Select[ Prime[ Range[ 5133]], Mod[ RamanujanTau[ # ], # ] == 0 &] (from Dean Hickerson (dean.hickerson(AT)yahoo.com), Jan 03 2003)

Cf. A000594. A proper subset of A063938.

Sequence in context: A050665 A090721 A066306 this_sequence A037948 A145380 A136740

Adjacent sequences: A007656 A007657 A007658 this_sequence A007660 A007661 A007662

hard,nonn,more

N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)