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A024517 Position of 2*n^2 in A000404 (sums of 2 nonzero squares). 4
1, 3, 7, 12, 18, 25, 34, 45, 56, 68, 82, 95, 112, 128, 146, 164, 183, 205, 227, 250, 275, 300, 325, 350, 382, 410, 440, 470, 503, 536, 569, 605, 642, 678, 717, 752, 794, 837, 878, 918, 963, 1007, 1054, 1101, 1147, 1196, 1246, 1293, 1348, 1401, 1452, 1506 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 03 2008, Table of n, a(n) for n = 1..130

PROG

(PARI) i=0; for(n=1, 1000000, f=factor(n); r=0; b=0; t=0; for(k=1, #f[, 1], if(f[k, 1]%4==1, r++, if(f[k, 1]%4==3, b+=(f[k, 2]%2), t=(f[k, 2]%2)))); if(b==0 && (r>0 || t==1), i++; if(issquare(n/2), print1(i", ")))) - Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 03 2008

CROSSREFS

Sequence in context: A027379 A055998 A066379 * A257941 A257944 A005228

Adjacent sequences:  A024514 A024515 A024516 * A024518 A024519 A024520

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 03 2008

STATUS

approved

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Last modified September 25 07:16 EDT 2020. Contains 337335 sequences. (Running on oeis4.)