A262252 - OEIS

A262252

Even Quasi-Carmichael numbers.

598, 1886, 11590, 21098, 24734, 32578, 91078, 95170, 107606, 134930, 143318, 179998, 253598, 258482, 259010, 287274, 361730, 374402, 568514, 706142, 751394, 831290, 920782, 1074026, 1105646, 1327562, 1514602, 1548318, 1579394, 1742830, 1794854, 1808678, 1952222

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OFFSET

1,1

LINKS

Tim Johannes Ohrtmann, Table of n, a(n) for n = 1..84

EXAMPLE

598 is even, composite and squarefree and at least one nonzero integer b exists such that for every prime factor p of n, p+b divides n+b (2): 598 = 2*13*23 and 4, 15, 25 all divide 600.

PROG

(PARI) n=0; until(n==1000000, n+=2; if(!isprime(n), if(issquarefree(n), f=factor(n); k=0; b=0; until(b==n, b+=2; c=0; for(i=1, #f[, 1], if((n+b)%(f[i, 1]+b)>0, c++)); if(c==0, k++)); if(k>0, print1(n, ", ")))))

CROSSREFS

Cf. A029562, A029564, A029566, A029568, A029570, A257750.

Sequence in context: A251224 A210384 A215195 * A252265 A029562 A273810

Adjacent sequences: A262249 A262250 A262251 * A262253 A262254 A262255

KEYWORD

nonn

AUTHOR

Tim Johannes Ohrtmann, Sep 16 2015

STATUS

approved