A372291 Numbers that occur exactly once in the odd bisection of A371094.

45, 69, 93, 141, 165, 189, 237, 261, 285, 333, 357, 381, 429, 453, 477, 525, 549, 573, 621, 645, 669, 717, 725, 741, 765, 813, 837, 861, 909, 933, 957, 1005, 1029, 1053, 1101, 1109, 1125, 1149, 1197, 1221, 1245, 1293, 1317, 1341, 1389, 1413, 1437, 1485, 1493, 1509, 1533, 1581, 1605, 1629, 1677, 1701, 1725, 1773, 1797

Offset: 1

Author

Antti Karttunen, Apr 26 2024

Keywords

• nonn

Comments

Numbers that occur exactly once in array A371100.

Examples

			45 is present because A371094(k) = 45 for no other odd number than k=7.
		

Links

• Antti Karttunen, Table of n, a(n) for n = 1..25365

Crossrefs

Cf. A371094, A371100.

Setwise difference A372290 \ A372292.

Programs

PARI

A371094(n) = { my(m=1+3*n, e=valuation(m,2)); ((m*(2^e)) + (((4^e)-1)/3)); };
isA372291(n) = if(!(n%2),0,my(c=0); forstep(k=1,n,2,if(A371094(k)==n,c++;if(c>1,return(0)))); (c));